A mosquito repellent which is sprayed on one arm and the other arm is not sprayed, is an example of independent variable.
A mosquito repellant is a chemical substance applied on the skin, clothes or any non-living object to avoid the appearance of mosquitoes on that surface. It is made of constituents like DEET, metofluthrin, oil of lemon-eucalyptus, picaridin, etc.
Independent variable in an experiment is that parameter which is changed. It has the potential to alter the results of the experiment as the effect on the experiment are influenced by this variable. It is called independent because no other variable can make changes in its effect.
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What features do skeletal muscle cells have that you can see under a microscope?A. long and thin with strìations and many nucleiB. small, striated, and only 1-2 nuclei per cellC. smooth, 1 nuclei, and connected by gap junctions
Skeletal muscle cells seen under a microscope would have long and thin striations an many nuclei, since this kind of cells, are actually
Answer:
A. long and thin with striations and many nuclei
Explanation:
Skeletal muscle cells are highly elongated cells with many nuclei. Under a microscope, skeletal muscle cells have a striated appearance.
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The complete chart indicating the number of chromosomes after meiosis, in body cells, in gametes and after mitosis are indicated in the given image.
Meiosis is the process of cell division in which the number of chromosomes are reduced to half. This is the reason why it is also called the reductional division. The process occurs in two phases: Meiosis I and Meiosis II. Meiosis I is the phase where actual reduction takes place.
Mitosis is the process of cell division where the daughter cells are identical to the parent cell. Here, the number of chromosomes remain the same and hence is called equational division.
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Can someone help with this ? Thank you if you can actually help
Answer:
a
Explanation:
Scenario: In a population of spiders living on Arachnid Island, most of the spiders are gray; a few are brown. On nearby Spider Island, there is another population of the same species. There, most of the spiders are brown; a few are gray. The ocean between these islands is full of hungry fish, and the spiders don't swim, so there is very little movement of spiders between the islands.Initial makeup of each population:Arachnid Island: 90% gray, 10% brown Spider Island: 10% gray, 90% brownThen a bridge is built to connect the islands so that tourists can ride their bikes from one to the other. The bridge is also a nice environment for spiders, so they start to move back and forth between the islands.How do you predict the makeup of the populations will be changed if this movement continues for many generations? Answer the questions below to identify and describe this change in the population.1. Is this an example of mutation, selection, genetic drift, or gene flow?
Due to the building of the bridge, now both spiders population are communicated and are able to cross, this will lead to the allele frecuency to vary, which is an example of genetic drift.
What type of growth graph is shown below for a woodpecker population?text Question 10 options:exponential growthlogistic growthlinear growth
When we are talking of population growth we must take into consideration more factors than just growth rate. In the case of exponential growth, we have that the growth rate per capita, that is to say per individual, is constant regardless of the population size, so it grows as the population grows. Meanwhile, in logistic growth, the growth rate per capita creases as the population size approaches a maximum imposed by the limiting resources, that is to say, the carrying capacity of an ecosystem. Therefore we can say that the correct answer is logistic growth.
What percent of your body mass is made of water?
Answer:
60%
Explanation:
In adult men, about 60% of their bodies are water. However, fat tissue does not have as much water as lean tissue. In adult women, fat makes up more of the body than in men, so they have about 55% of their bodies are made of water. Most of the human body is water, with an average of roughly 60%. The amount of water in the body changes slightly with age, sex, and hydration levels. The amount of water in the human body ranges from 60-80%. The brain and heart are composed of 73% water, and the lungs are about 83% water. The typical percentage of the human body that is water is 60% in adult men according to Dr Jeffrey Utz of Allegheny University and 50% in adult women.
The cell membrane is mainly made up of lipids and proteins. It acts as a barrier to the surrounding environment. Which of the following statements about lipids BEST supports the argument that lipids help protect the contents of the cell?
Responses
Lipids that are placed in water do not dissolve.
Lipids that are placed in water do not dissolve.
The tail of a lipid is made of carbon and hydrogen.
The tail of a lipid is made of carbon and hydrogen.
Individual lipids in a membrane can rotate freely.
Individual lipids in a membrane can rotate freely.
Lipids are composed of a head and a thin tail
Lipids helps in protecting the contents of cell because it is hydrophobic , when placed in water they do not get dissolve.
There is a characteristic that unites the various chemicals that make up lipids. Insoluble in water, lipids are hydrophobic ("fear of water"). In a cell, lipids have a wide range of activities. Fat-like lipids, often known as lipid stores, are how cells keep energy for long-term use. For both plants and animals, lipids act as a barrier between them and their surroundings. As an illustration, their water-repellent properties aid in keeping aquatic birds and mammals dry. A significant component of the plasma membrane, lipids serve as the building blocks for numerous hormones. The several types of lipids are fats, oils, waxes, phospholipids, and steroids.
Thus, lipids cell membrane are the structural barrier of cell and helps in protecting its contents .
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Which group of scientists introduced the Three Domaine System?Aristotle and SocratesB. Fox and LinnaeusC) Woese and Fox
Solution:
The three-domain system is a biological classification introduced by Carl Woese et al (Fox). in the year 1990. In this classification, the cellular life forms are divided into the following 3 domains;
1. Archaea,
2. Bacteria and
3. Eukaryotes.
So that, we can conclude that the correct answer is:
C) WOESE AND FOX.
Vascular plants have several specialized organs. Which one is matched correctly?A. Fruits: specialized in reproductionB. Cones: Specialized in reproductionC. Flowers: Specialized in reproductionD. All of them are correct
The vascular plants have several specialized reprodutive organs, which one responsible for one stage of the process of reproduction. The flowers are reprodutive organs, as well as fruits and cones, however they function in reproduction is distinct. The flowers is the most complex reproductive organ, since it is composed by for different structures (carpels, staments, petals and sepals), the cones are where the seeds are produced in the female plants during sexual reproduction after being fertilised by male gametes (pollen), and the fruits are the result following the pollination that are important to continuity of plants generations. Therefore, the alternative D (all of them are correct) is the answer for that question.
SC.7.N.3.1 (assessing SC.6.N.3.1)8. Which of the following would be considered a theory?A. Animal research is more effective in labs that are outdoorsB. The universe was created from a single massive explosionC. Nuclear energy should be widely used to produce energyA cold front will arrive in 6 hours and result in heavy rainD
The universe was created from a single massive explosion would be considered a theory because it can't be tested directly,
The lymphatic system contains a network of vessels that transport fluids very similar to what other body system?Skeletal systemCardivoascular systemMuscular systemNervous system
Lymphatic system
The lymphatic system is made up of vessels and lymph nodes and its main function is the transport and circulation of fluids that are present in the body's tissues.
Thus, we can say that the lymphatic system resembles the cardiovascular system because the cardiovascular system is also composed of vessels and its main function is to circulate blood in the body.
So "cardiovascular system" is the answer.
Identify the type of neuron that carry information from the sense organs such as the tongue, nose, skin, ears, and eyes to the spinal cord and the brain so that the stimuli received from these organs can be processedSensory neuron Interneurons Motor neuron
In order to connect stimulus perceived (which is done by the sensory neurons) with thecore nervous centers, a connector is required, this gap is filled by the interneurons. Interneurons are aimed to connect sensory data from the input (sensory organs) to the organs where this info is processed.
I need help with this practice problem I answered it, however, I’m struggling with if I am right…
Your answer is right.
First of all organic matter (organisms) sink to the bottom of an ancient ocean and mix with the inorganic. This cretes an organic-rich mud that can only form in still water enviroments. This mud cannot be exposed to too much oxygen.
If this shale is buried some kilometres, its temperature increases due to the location in the Earths interior. This increasing pressure and temperature transforms it into oil.
If the organic material is recycled by microorganisms, this process cannot occur.
6. Use complete sentences to define the following terms or phrases in your own words.Short AnswerA. NeanderthalB. BipedalC. GenusD. Species (Include what members of a species can do)
A. Neanderthal- they are the closest extinct human relative that lived in Europe and Asia about half a million years ago to 30 thousand years ago. They had archaic head features and stocky bodies.
B. Bipedal- refers to having two legs that are used for walking or for locomotion. It could also define as having two legs that are used mostly for movement. Examples of bipedal include humans, great apes, kangaroos, and the like.
C. Genus- a part of a taxonomic category that is placed after Family. This classification includes organisms that are closely related to each other and are made up of one or more species.
Example: Genus: Equus
Species: Equus quagga (zebra)
Species: Equus caballus (horse)
D. Species- refers to the taxonomic category that is placed after the Genus. This includes organisms that are capable of interbreeding and producing fertile offspring.
Example: Ursus americanus (black bear)
41
2 points
Atoms and molecules represent the
O organ
0000
cellular
chemical
tissue
level of organization.
Time Remaining
Answer: Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds.
Explanation
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Why does the majority of photosynthesis occur in the leaves:1: roots are not exposed to sun since they are underground2: leaves contain chloroplasts which create store energy molecules3: all answers are correct
The correct option is 3.
The leaves have specific shapes that create the most efficient surface to absorb sunlight. Also, stomas are found mostly on the leaves, structures that allow the gas exchange: the CO2 enters into the leave, and O2 leaves it.
I need help with this practice problem solving *Amy lives in Tennessee, *the southern United States. She is looking in her backyard for any organisms she can find (any common plants, animals, mushrooms, etc.) She needs to find three and write a general description of each, an identification if possible, and the quantity of individuals she seesWhat 3 species might Amy come across? (It can be any general species that may be found in the south U.S) give a general description of the species (can be short), an I.D of each, and how many you may come across (is it a single organism? are they few, or many?) *as seen in the photo provided
Question: what 3 organisms one could be found in Alabama’s biome?
Solution (explanation):
Let us remember that a biome is understood as each ecological unit into which the biosphere is divided according to a set of climatic and geological factors that determine the type of vegetation and fauna.
Alabama is one of the most biologically diverse states in the United States of America and is a global hotspot of diversity for several groups of plants and animals. In fact, this diversity is a product of Alabama's climate, geologic diversity, and rich evolutionary past. Alabama has more than 6,350 species.
One of the organisms in Alabama is the Salamanders which are one of several groups of southeastern organisms that are famous for their degree of speciation. In fact, the ecosystem of Alabama houses Red Hills Salamander.
On the other hand, the most dramatic evolutionary influence of the Southern Appalachian Mountains has been on Alabama's freshwater fauna. In fact, in Alabama, we can find fish, snails, mussels, and crabs because they are all easily isolated in the shallow streams in the headwaters of major rivers. Consequently, more freshwater species are found in the Southeast than anywhere else outside the humid tropics. Alabama is at the center of this aquatic biodiversity hotspot. In fact, speciation was especially rampant in the Tennessee River and Mobile River Basin. Therefore, another organism that we could find in the ecosystem of Alabama is the fish Vermilion Darter.
Finally, the region has more than 100 plant genera, for example, an example of another organism found in the Alabama ecosystem is the American beech.
Answer: we can conclude that the correct answer is: we can conclude that 3 organisms that one could be found in Alabama’s biome?
1. Red Hills Salamander.
2. Vermilion Darter.
3. American beech.
You are studying an Newley discovered organisms karyotype. So far, you have discovered that is is diploid and has 15 homologous chromosomes. After S phase, how many homologous chromosomes, individual chromosomes, and sister chromatids are present in this new organism?
Karyotype have 23 pairs of chromosomes
What is Karyotype ?
Each eukaryotic species' nuclear genome is split up across several chromosomes that are specific to that species. A haploid human nucleus (i.e., sperm or egg) normally has 23 chromosomes (n=23), whereas a diploid human nucleus has 23 pairs of chromosomes. The term "karyotype" refers to an individual's total number of chromosomes. Each of the 46 structures is a replicated chromosome, despite the fact that it is challenging to see the two sister chromatids for each chromosome at this resolution because the cell was in metaphase.
There are 46 chromosomes, as expected. The chromosomes' lengths vary, as you can see. In fact, this characteristic inspired the names of human chromosomes. One is our longest chromosome; two is the next longest; and so on. The chromosomes are often grouped into the pattern depicted , and the resulting picture is known as a karyogamy. A geneticist can ascertain a person's karyotype via a karyogamy, which is a written depiction of their chromosomes that includes any abnormalities.
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what is the role of antibiotics is atropine
Atropine is a prescription medicine that is used to treat the symptoms of low heart rate (bradycardia), reduce salivation and bronchial secretions before surgery, or as an antidote for overdose of cholinergic drugs or mushroom poisoning. Atropine may be used alone or with other medications.
What is a scientific term that means rising crust?
The scientific term for rising crust is uplifting.
Uplifting is the sudden appearance of the land or rocks that were buried deep down inside, to the earth's surface. This may happen due to some upward force from the inside. Uplifting may also happen due to some activity in the tectonic plates.
Crust is the outermost layer of the Earth. It is the thinnest layer that goes only 40 km deep. The crust is composed of solid rocks and minerals. The rocks include sandstone, limestone, igneous and metamorphic. And the minerals are oxygen, silicon, aluminum, iron, etc. The crust also exhibits buoyancy.
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9. As the temperature increases, the chemical reaction
A. Speeds up
B. Slows down
C. Stays the same
Answer: A. Speeds up
Explanation: Increasing the temperature increases the speed of the reactant molecules.
In a respiration experiment we are measuring the rate alcoholic Fermentation in yeast by measuring the amount of CO2 produced Please assist with following questions
Answer and explanation:
1. sources of error- in the experiment, the amount of carbon dioxide released by east is monitored, a source of error could be the carbon dioxide present in the atmosphere which would interfere with the results.
2. baking recipes add sugars and molasses to provide carbohydrates for the yeast. this acts as a source of energy for the fermentation process.
3. the respiration of yeast could be monitored by measured the amount of sugar used or by measuring the amount of ethanol produced in the respiration process
4. high concentrations of sugar my inhibit yeast activity most likely because of the high osmotic concentration which prevents yeast from getting enough water for growth. as the osmotic concentration increases a yeast cell will reach a pont where water moves out of the cell.
Heartburn occurs when stomach acid escapes the stomach and burns the tissues of the esophagus. Baking soda is sometimes
used as an antacid. How does baking soda help relieve symptoms of heartburn?
Baking soda is used as an antacid during heartburn because: (a) The baking soda is serving as a buffer to take up excess H+ ions from stomach acid.
Antacid is a medication used to neutralize to excessive acid inside the stomach and also cure heartburn as well as indigestion. They can come as liquids or as tablets. The composition of antacids must include aluminum hydroxide. magnesium carbonate, etc.
Baking soda is a bicarbonate with the chemical formula NaHCO₃. It is a very versatile compound used in a variety of ways like in cooking, as a odor repellant, for cleaning and also as an antacid.
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Read the following paragraphs from the section "Open Defecation Is A Dangerous Practice."In sub-Saharan Africa — the lands south of the Sahara desert — the proportion of the population practicing open defecation is slightly smaller. It stands at around 23 percent. Still, 40 percent of the population in this region lacks safe drinking water. Moreover, gender inequality there is more prominent than in South Asia. In sub-Saharan Africa, more than 25 percent of the population must walk 30 minutes or more to collect water. This task falls on women and girls nearly all the time. In fact, this collection happens in many poorer, developing nations. It takes critical time away from women.Moreover, Africa has a high risk of desertification. This is the process by which land becomes desert. This reduces the availability of freshwater even further and increases the threat of water inequality in the future.How is the central idea developed in these two paragraphs?Question 4 options:by giving an example of how lack of infrastructure and advanced treatment facilities cause water inequalityby showing that sub-Saharan Africa is the region most affected by water inequality in the worldby describing how lack of fresh drinking water affects people suffering from water inequalityby explaining how open defecation is the main reason behind contamination of water
The correct option is the first one "by giving an example of how lack of infrastructure and advanced treatment facilities cause water inequality". Since, the paragraphs deal with these two core ideas: 1.- desertification danger and its consequences; 2.- the precarious conditions and gender inequity to obtain water.
Which physical change is usually more pronounced in adolescent males than in females?A. widening of the hipsB. accelerated gonad growthC. growth of body hair D. development of sweat glands
During puberty, the body goes through many internl and external changes. Puberty begins when an area of the brain called the hypothalamus starts signaling to the rest of the body that it is time to develop adult characteristics. These hormones cause growth and changes in different parts of the body.
Pluripotent stem cells are of particular interest to stem cell research because they have the abilityto develop into any cell type in the body. This means they could be useful in treating diseases suchas cancer, Parkinson's disease, and multiple sclerosis.Why is the study of pluripotent stem cells controversial?O A. because they are created by cloningOB. because they are isolated from human embryosOC. because they can transform into cancerous tissueD. because they are created artificially in Petri dishes
Answer
B - because they are isolated from human embryos
Explanation
Stem cells are undifferentiated or partially differentiated cells that can differentiate into various types of cells and proliferate indefinitely to produce more of the same stem cell. They are the earliest type of cell in a cell lineage. They are found in both embryonic and adult organisms
what types of natural phenomena can cause blooms
Which of the following would be a reasonable conclusion if hair was found to have a drug in the root but not in the rest of the hair strand?
Drug use is not identified.
Drug use is currently happening.
Drug use stopped several weeks ago.
Drug use has occurred for several months.
Drugs use different mechanisms to incorporate and fixate into the hair, and these are useful to determine if a person is currently consuming drugs or not, and for how long. Option B) Drug use is currently happening.
How are drugs incorporated into the hair?
Several studies have been done to explain drug incorporation mechanisms in hair. Among different mechanisms, the most significant ones are,
Active or passive diffusion from blood to the dermal papilla from which hair grows.Through sweat and other secretions.From the environment that might deposit drugs on hair.
Usually, before making a drug analysis, hair must be washed to avoid considering external environmental drugs deposited on hair (the last option).
Once drugs incorporate into the hair, they bond to different components composing highly stable complexes that can not be altered for several years. In fact, drugs can remain in the hair for hundreds of years.
According to this information, if after the analysis drugs were only found in the hair root, it might suggest that drugs are recently and currently being consumed.
Option B is correct. Drug use is currently happening.
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Answer: The answer is C
Drug use stopped several weeks ago!
Explanation:
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Which do you think has more influence on a person's weight: genetics, upbringing, or the environment?
Genetics may play a great role, but upbringing could be more important since the eating, exercising and food selection habits could be acquired during this period. Aditionally, the often high price of healthy food and lack of knowledge about how to follow a balanced diet are some socioeconomic asociated factors, related to the upbringing, that must not be ignored.
Answer:
environment
Explanation:
example public
Which of the following are formed during photosynthesis?A. C6H1206 and 0₂OB. C₂H4O2 and 02OC. C6H1206 and H₂0OD. C₂H4O2 and H₂O
A. C₆H₁₂O₆ and O₂ are formed during photosynthesis.
6CO₂+6H₂O→C₆H₁₂O₆+6O₂; Photosynthesis' Reaction
Photosynthesis is a prominent reaction in green plants. Chlorophyll is the main pigment responsible for trapping sunlight. Stomata primarily capture carbon dioxide, one of the raw materials. Water and oxygen are the by-products of it.
Glucose is the primary product formed in the process. The photosynthetic products are transported as sucrose and stored as starch.
Photosynthesis is divided into Light reaction and Dark reaction, on the basis of the availability of light. Carbon dioxide is reduced to carbohydrates and water is oxidized to oxygen.
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