As we know exoskeleton is a characteristic of arthropods and other invertebrates, all vertebrates like us humans have an endoskeleton so they could not present such characteristics, finally, worms do not possess an exoskeleton, true that they are invertebrates however their phylum implies a soft body. Therefore the correct answer is option B.
During which of thefollowing time periods didmost plant and animal phylaAppear?
The Cambrian period. Cambrian explosion, the unparalleled emergence of organisms between 541 million and approximately 530 million years ago at the beginning of the Cambrian Period. The event was characterized by the appearance of many of the major phyla (between 20 and 35) that make up modern animal life.
Some adult chordates do not exhibit the characteristic features of the phylum Chordata. What is the likely reason?
A likely reason why some adult chordates do not exhibit all the characteristic features of the phylum Chordata, is that some features are present during development but are subsequently lost or become another structure. (option 2)
Poikilotetherms - how they use behavior to maintain body temperature
Because poikilotherms lack the physiological ability to generate heat, their body temperature tends to conform to that of their surroundings in the absence of any behavioral intervention. Poikilotherms include "cold-blooded" animals (Kearney et al.).
How poikilotherms maintain their body temperature?
Cold stress or heat shock can alter membrane properties in poikilotherms, causing damage and, potentially, death if not corrected quickly. Low temperature stress is mitigated by modifying membrane lipids to lower their average transition temperature.The hypothalamus, a part of our brain, regulates our internal body temperature. The hypothalamus compares our current temperature to the normal temperature of around 37°C. If our body temperature falls too low, the hypothalamus ensures that heat is generated and maintained.The metabolic rate of poikilotherms increases with increasing temperature. Poikilotherms respond to temperature increases with a standard performance curve that includes increased performance, a maximum, and then declining performance as temperature rises further.To learn more about : Poikilotherms
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Which phrase describes a density-independent limiting factor that can affect
Fiting
ecosystem stability?
A. High herbivore emigration from a grassland
B. Dune erosion by ocean water along a shoreline
C. An increase in the carnivore population in a desert
D. Two large populations competing for the same food source
The phrase dune erosion by ocean water along a shoreline best describes a density-independent limiting factor that can affect ecosystem stability (Option B).
What is a density-independent limiting factor?A density-independent limiting factor can be defined as any factor in a given ecosystem that may alter the homeostasis of the population that lives in a given geographic area.
These factors (density-independent limiting factors) are generally abiotic factors such as hurricanes, extreme temperature conditions, the presence of contaminants in the air that hamper life in a given area, etc.
Conversely, density-dependent limiting factors are biotic factors such as competitive species that alter the development of another population.
Therefore, with this data, we can see that a density-independent limiting factor is any abiotic condition that may alter the life of a population in a give geographic area and thus alter the homeostasis of the whole ecosystem.
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Answer:D
Explanation:
Which is NOTtrue aboutdredging?A. This is a naturally occurring process.B. It removes sediment from the bottom ofbodies of water.C. It is a form of habitat loss.D. It disrupts the organisms that live at thebottom of rivers and lakes.
Dredging by definition is the removal of sediments from the bottom of water bodies such as lakes, rivers, reservoirs, and others, this process is done mainly to maintain the water flow, deth or even increase it, as such is an entirely artificial process, therefore we can say that the correct answer is option A.
Answer:A
Explanation:
This element can form a wide variety of substances, including long chains. The different substances it forms are central to the molecules found in living things.What element it this?a) carbonb) oxygenc) hydrogend) nitrogen
Introduction to Biology: Biomolecules
In the options, they are listing the four more abundant elements in living beings: carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). Given that all of them are essential to forming the molecules found in living beings, we need to check their chemical properties, because they are telling us that is an element that can form long chains.
• Hydrogen, has only 1 electron and can form one bond at a time, so it cannot form long chains
,• At normal conditions, ,Oxygen, form molecules of only 2 oxygen atoms (O₂), not long chains.
,• Nitrogen, is a similar case to oxygen because at standard temperature and pressure it forms a diatomic gas (N₂)
,• Carbon ,has ,4 atoms that can form covalent chemical bonds,, which allows it to form ,polymers, at, standard temperatures.
This means the correct answer is a) carbon.
*Explain thoroughly how deforestation affects the fertility of the impacted land?*
Deforestation can have destructive effects on soils. Trees and shrubs shield the ground from the force of raindrops and provide shade that reduces surface soil temperature, which in turn reduces evaporation. Logging and small-scale removal of trees exposes soil to rain splash which loosens and dislodges soil particles, eroding soil and creating a more impermeable bare surface, which increases runoff.
It was found that the majority of soil fertility indices were affected negatively by deforestation and more than half of the organic matter was lost to deforestation, which, in turn, could lead to deterioration in soil quality or land productivity capacity.
Please help with Biology question
Answer:
from the pelvis or to more distant parts of the abdomen.
Explanation:
HELP!!!!
Which conditions are necessary for snow to form?
a) The temperature of the air in the cloud is above freezing.
b) The temperature of the air below the cloud is above freezing.
c) The temperatures of the cloud and the air below the cloud are at or below freezing.
d) The temperature of the cloud is below freezing, while the air below the cloud is above freezing.
Answer:
im pretty sure its c but this is what i found on the web: the atmospheric temperature is at or below freezing (0°C or 32°F).
Explanation:
Answer:
im pretty sure its c but this is what i found on the web: the atmospheric temperature is at or below freezing (0°C or 32°F).
Explanation:
the place where a river begins is called?
The place where a river begins is called source or headwaters, being the rivers the construction from water that comes of smaller streams that join together forming tributaries.
How does the cerebral spinal fluid (CSF) protect the spinal cord?
The cerebrospinal fluid provides hydromechanical protection, acts as a mechanical shock absorber, makes the spinal cord and brain become buoyant (reduce the effective weight), as well as provide nutrients to the central nevous system. Being an important form of protection to the central nervous system.
Available energy ___________ as it is transferred from one organism to another in a food chain.
Answer:Key Points. Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.
Explanation:
Which of the following statements correctly describes cis-trans isomers?
A) They have variations in arrangement around a double bond.
B) They have an asymmetric carbon that makes them mirror images.
C) They have the same chemical properties.
D) They have different molecular formulas.
E) Their atoms and bonds are arranged in different sequences.
Answer: D
Explanation:
When both double-bond carbons are directly connected to a carbon and a hydrogen, cis-trans can happen. In this instance, a new isomer is produced by switching the substituent on one of the double-bond carbons. Thus, option D is correct.
What are the factor that affect cis-trans isomers?The molecule must restrict rotation. Each doubly bound carbon atom must have two nonidentical groups.
Molecules with the same atomic connectivity are what the cis isomers are known as. On the same side of the double bond, they stand in for comparable page groups.
Cis-trans isomers display a form of stereo isomerism, in which the atoms are arranged differently in three dimensions.
Therefore, On the other hand, trans isomers are made up of molecules with comparable side groups that are situated on the other side of the double bond.
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This passage describes the flower position trait in pea plants:Flowers can grow in different positions on a pea plant's stem. Axial flowers arein the middle of the plant's stem. Terminal flowers are at the tip of the stem.In a group of pea plants, some individuals have axial flowers and others have terminalflowers. In this group, the gene for the flower position trait has two alleles. The allele F is foraxial flowers, and the allele f is for terminal flowers.A certain pea plant from this group has axial flowers. This plant has one allele for axialflowers and one allele for terminal flowers.Based on this information, what is this pea plant's genotype for the flower position gene?axial flowersFfffterminal flowers
Axial flowers are in the middle of the plant's stem.
Terminal flowers are at the tip of the plant's stem.
The alleles that code for the trait "position of the flower" are F: axial flowers, and, f: terminal flowers.
A pea plant has axial flowers (Phenotype of the plant)
You know that it has one allele for axial flowers, F, and one allele for terminal flowers, f.
→ The genotype of the plant is then Ff (heterozygous)
Answer:
Yes
Explanation:
why is it important to calculate the diameter of the field when first using the microscope? bboldiitalicsuunderlinebulleted listnumbered listsuperscriptsubscript
You can calculate the real size of small objects with the microscope, so in a field, it is important to calculate the diameter.
What is a microscope?You may determine the actual size of things that are too tiny to be seen with the eye by measuring the microscope's field of view.
The largest useable field diameter in early microscope objectives typically ranged from 18 millimeters or less, but with a contemporary plan, it can occasionally approach 26 millimeters.
A microscope measurement can be used to classify an object into a certain size group or to determine whether the produced form of a specific feature is within dimensional.
Therefore to find the size of the smallest object in the microscope calculates the diameter of the field.
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Need help with this question will global warming have catastrophic effects?
Global warming is predicted to produce an increase in extreme temperatures and it is caused mainly by an increase in CO2 levels. The increasing temperatures are likely to cause a modification in air circulation patterns and increase evaporation, among others. These have consequences over climate and produce an increment over frequency and magnitude of extreme climatological events (like hurricanes). Also, global warming leaves no place for adaptation (as it is fast compared to biological adaptation), so many species are likely to go extinct, with important ecological effects. I consider these to be catastrophic effects.
What is equilibrium?A. a state where things aren't changingB. a state where species are constantly movinghabitatsC. a state where a population is evolving
The correct answer is C. a state where a population is evolving. Evolution is happening right now in all populations, but it is very slow in macroorganisms (animals and plants that we can ses). So, a popul
Sickled red blood cell normal red blood cellSickled red blood cells carry less oxygen than normal red blood cells. What does this demonstrate about mutations in the DNA thatcodes for hemoglobin?OA. These mutations can change the structure and function of hemoglobin.OB. These mutations decrease the amount of oxygen available to bind with hemoglobin.OC. These mutations are unable to affect the structure and function of hemoglobin.OD. These mutations can change the structure of oxygen so that it does not bind to hemoglobin.
The answer is the letter A. These mutations can change the structure and function of hemoglobin.
The effect of the mutation in the hemoglobin is it altered its structure that makes
A recession may be defined as
A.6 quarters of declining GDP
B.6 months of declining GDP
C.6 months of rising GDP
D.6 quarters of rising GDP
A recession may be defined as A.6 quarters of declining GDP
What three things define a recession?Recessions are times of economic collapse that are indicated by rising unemployment, falling stock prices, and a decline in the housing market.
A recession is characterised as a protracted period of real GDP (output) growth that is weak or negative and is accompanied by a considerable increase in the unemployment rate. A recession also weakens a lot of other economic activity indices.
In simple words, a recession occurs when the economy's performance declines over a protracted period of many months, as seen by a reduction in GDP, an increase in the unemployment rate, and decreased consumer expenditure. A recession may have a huge influence on people's daily life.
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The F1 offspring of a cross has been provided for you. It is your job to work backwards in order to determine the genotypes, the genetic makeup, of BOTH parents that produced each cross. More specifically, what parental genotypes would give you these possible genotype combination?
To fill the Punnett Square we must place the alleles from one of the parents horizontally oriented on the top of a 3x3 diagram, and the alleles from the other parent vertically oriented on the left border of the diagram. After that, we must cross each one of the alleles from one parent with the alleles of the other, positioning the result of those crossings (Ee) in the blank space where those alleles meet. Therefore, we must look at the combinations and extract the allele that appears in the same line or in the same column, as follows:
Therefore, the parental genotypes are: EE x ee.
Why are the studio habits of mind important
Answer:
because it helps guide and if inform choices
Explanation:
Which type of energy travels from the Sun to the earth and makes the sky appear bright during the day?. A. Sound energy
B. Mechanical energy
C. Electrical energy
D. Light energy
right answer - D. Light energy
True or False: Blood sugar would be lower than normal if liver cells did not have receptors for glucagon.
The answer to the statement " Blood sugar would be lower than normal if liver cells did not have receptors for glucagon " is true.
Why the blood sugar level decreases when liver cells lack receptors for glucagon?It happens that when the liver cells within our body system is short of it deficient of the
glucagon receptor, it usually, frequently and most of the time results in the decreament of the sugar in the blood volume.
However, the hormone known as the glucagon which is manufactured in the pancreas which is designed to stimulate our liver to release the glucose that is previously stored in the body system to the blood stream. Our body system, when it falls on under secretion or over secretion of certain hormones or other substances, it shift the normal body functioning negatively.
So therefore, the absence of glucagon receptor would lowers the blood glucose levels in the blood stream.
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Help asap…
1. Which lobe of the brain is primarily responsible for integrating visual input (sight) and touch input from the skin?
A.frontal
B.occipital
C.temporal
D.parietal
Answer: D) the parietal lobe
Explanation:
- the parietal lobe is responsible for sensory perception and integration, including the management of taste, hearing, sight, touch, and smell. It also includes the brain's primary sensory area where the brain interprets input from other areas of the body
hope this helps :)
Answer:
I hope this helps.
Explanation:
Which of the following areas of study would be in the branch of earth science
• habitats or behaviors
• rocks or minerals
• heat or motion
• bacteria or cells
Answer: rocks or minerals
Rock or minerals are in the branch of earth science. It deals with natural chemicals and materials on the earth, and rocks and minerals fit into the category as geology is one of the main areas of earth science.
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Smooth muscles are described as…a) Voluntaryb) Involuntaryc) Striatedd) Cardiac
Smooth muscles
This type of muscle comprises smooth muscle fibers that correspond to uninucleate cells, thin and pointed at the ends. This muscle forms the contractile portion of the walls of various organs such as the digestive tube and blood vessels, which is why it is characterized by involuntary contraction (option b).
Which of the following would result in an increase in plant growth?A. Decreased amount of other plant species, decreased amount of sunlight.B. Increase amount of other plant species, decreased amount of water.C. Decreased amount of herbivores, increased amount of sunlight.D. Increased amount of herbivores, increased amount of water.
All plants need the right temperature, light, water, air, and food to have a proper metabolism and to grow. The height of the plant is directly related to the number of nutrients in the soil and the light for its photosynthetic processes. On the other hand, the lower the number of herbivores, the less likely it is that the branches will be cut and the height of the plant will be reduced.
We can conclude that the correct answer is:
Answer:C. Decreased amount of herbivores, increased amount of sunlight.
Studying the devastating effects of a tsunami can be included in which type of
science?
Answer:
earth science
Explanation:
earth science is the study of earth, the atmosphere, and the outer space
How many atoms total are found in 4C2H6
Answer: Molecular Weight of 4C2H6
120.2762 g/mol
The molar mass and molecular weight of 4C2H6 is 120.276.
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What’s the correct answer answer asap for brainlist
Answer: B
Explanation: