Answer:
Examples of fission and fusion
For example, the so-called hydrogen bomb (or H bomb) is actually a deuterium–tritium bomb (a D–T bomb), which uses a nuclear fission reaction to create the very high temperatures needed to initiate fusion of solid lithium deuteride (6LiD), which releases neutrons that then react with 6Li, producing tritium.
Explanation:
Water fleas (Cladocera) are small freshwater crustaceans. They are filter feeders can are about 3-5mm long. The outer carapace of a water flea is transparent so the internal organs can be observed. Caffeine raises the heart rate of humans. Hanna predicts caffeine will have the same effect on other organisms. She uses the water flea as her test subject in an experiment. Hanna introduces varying amounts of caffeine to water flea populations. Using a microscope, she measures the heart rate in beats per second of sample water fleas. She records the data in a table. As the concentration of caffeine increases, Hanna observes the water flea heart rate also increases. What is the hypothesis in Hanna’s experiment? A) Caffeine raises the heart rate of humans. B) Water fleas prefer caffeine over plain water. C) Caffeine increase the heart rate of the water flea. Eliminate D) The effects of caffeine are the same on all organisms.
Answer:
The Answer is C.
Explanation:
sorry i took awhile
The hypothesis is the part of the scientific method that is the supposition based on some observed data. In Hanna's experiment, "caffeine increase the heart rate of the water flea" is the hypothesis. Thus, option C is correct.
What is a hypothesis?The hypothesis has been defined as the conjecture that is proposed in a scientific method and is based on the speculations from the observed facts and information. It is proposed to perform the experiment and reach the conclusion of the reliability.
They are testable and are performed through the experimental design that includes the experimental and control group so that the collected evidence can be analyzed and proved to be true. In Hanna's experiment, the effect of caffeine on the heart rate of fleas is a hypothesis.
It is a hypothesis as it is based on the observed fact that caffeine increases the human heart rate. The caffeine acted as the independent variable and the heartbeat was the dependent variable that showed that water fleas have increased heartbeat if given caffeine.
Therefore, option C. caffeine increases heartbeat is the hypothesis.
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Where in the Cell is DNA found?
Mitochondria
Ribosome
Nucleus
Cytoplasm
Answer:
Nucleus
Explanation:
have a nice day !!
Answer:
[tex]\boxed {\tt Nucleus}[/tex]
Explanation:
DNA, or deoxyribonucleic acid, carries genetic information and instructions for making proteins. In a eukaryotic cell, DNA is mostly found in the nucleus, but it is in other organelles, like the mitochondria. Since the majority of the DNA is in the nucleus, the correct answer is C. nucleus.
The Jurassic is a period of what era?
Transpiration is the loss of water from the leaves of plants. The stomata of leaves must
open to allow carbon dioxide to enter the leaf for photosynthesis, but when they are open,
water vapor escapes into the atmosphere.
HYPOTHESIS: As the intensity of light is increased, the rate of transpiration will increase,
as measured in by the loss of mass of the plant.
what is the independent and dependent variable HELP
Answer:
Explanation:
dependant= loss of mass of the plant (not sure) as you're measuring it i guess? or it may be transpiration. which one are you actually measuring
independent=light of intensity as you're changing
You use
friction when you leave marks on paper with a
pencil “lead."
Answer:
Yes, this is true
Explanation:
I hope I helped.
Hummingbirds are an example of a _____ because of the pollination they provide.
Answer:
The correct answer is "pollinator".
Explanation:
Insects are the first animals that come to mind when we think about pollinators, however hummingbirds are an excellent example of pollinators as well. Hummingbirds feed frequently from flowers, transferring grains of pollens from a flower to others. Some species of flowers have adapted to develop some traits to attract hummingbirds, such as certain color, shape and scent.
According to the lecture, what does all life depend on? What happens to bonds during chemical reactions? What is bond energy? How is energy related to bonds breaking and bonds forming? How will you know if/when a reaction is in equilibrium? What is activation energy and how is it related to a chemical reaction? What is the difference between exothermic and endothermic?
bonds inflicarate,rlr4lr4
Can you help me with this please i will give you a branlist and it’s science
answer is A out of the choices
Answer:
C
Explanation:
Which of these fields of science is the study of the atmosphere, including
climate and weather?
O A. Meteorology
O B. Oceanography
C. Hydrology
D. Geography
Answer:
It is actually Meteorology if im correct
Explanation:
i was learning it a couple weeks ago again lol
Meningitis is a disease that is characterized by swelling of the meninges that puts pressure on the brain. Which is
least likely to be a symptom of this disease?
severe headache
O swollen ankles
sensitivity to light
O confusion
Severe headache is symptoms of meninges. thus option A is correct.
What is meningitis disease and how it caused?Meningitis is an infection of the protective membranes that surround the brain and spinal cord (meninges). It can affect anyone, but is most common in babies, young children, teenagers and young adults. Meningitis can be very serious if not treated quickly. Meningitis is usually caused by a viral or bacterial infection.
Some common symptoms of meningitis:-
Sudden high fever.
Stiff neck.
Severe headache that seems different from normal.
Headache with nausea or vomiting.
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which printer
uses light to create
Impressions on paper
Answer:
An LED printer is a type of computer printer similar to a laser printer. Such a printer uses a light-emitting diode (LED) array as a light source in the printhead instead of the laser used in laser printers and, more generally, in the xerography process....
Hope it helps you....Thanks....
Which statement describes the cyclic nature of seafloor spreading?
Continents are created.
New oceanic crust is created.
Volcanoes erupt and remove crust.
Old crust gets thicker at subduction zones.
Answer:
New oceanic crust is created
Explanation:
The statement 'New oceanic crust is created' describes the cyclic nature of seafloor spreading.
What is seafloor spreading?Seafloor spreading is a phenomenon where plates on the Earth separate apart from each other in geological time.
These plates on the Earth are called in geology 'tectonic plates' and form part of a layer known as the lithosphere.In conclusion, the statement 'New oceanic crust is created' describes the cyclic nature of seafloor spreading.
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Researchers propose a model to explain variation in phytoplankton cell sizes in a marine environment. They base their model on the idea that smaller cells absorb nutrients more efficiently. The researchers predict that the mean diameter of phytoplankton cells will change by 50 micrometers for every 5-kilometer increase in distance from the shore because of a gradual decrease in nutrient availability. To test their model, the researchers determine that the phytoplankton cells found closest to shore have a mean diameter of 900 micrometers. Based on the model, what will be the mean diameter of the phytoplankton cells that are found 25 kilometers from shore?
The mean diameter of phytoplankton cell is 650 micrometers at a distance of 25 kilometers from the sea shore.
The mean diameter of phytoplankton cell is 650 micrometers because at every 5 kilometers, decrease occur in the diameter of phytoplankton cell about 50 micrometers and we know that the the diameter of phytoplankton cell is 900 micrometers so for 25 kilometers there is 250 micrometers decrease occur in the diameter of phytoplankton cell.
So this 250 micrometers are substracted from 900 micrometers we get 650 micrometers. So we can say that the mean diameter of phytoplankton cell is 650 micrometers at 25 kilometers distance from the sea shore.
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Students in a science class were asked to investigate how missing or damaged
organelles affect cellular homeostasis for cells found in muscle tissues.
Which of the following questions should they ask to determine if these muscle cells
are functioning properly? (AKS 151)
At what rate do the chloroplasts of the cell need to capture enough sunlight to
meet the high energy needs of the cell?
At what rate do the ribosomes of the cell need to work to produce enough
glucose to meet the high energy needs of the cell?
At what rate do the mitochondria of the cell need to convert glucose to usable
energy molecules to meet the high energy needs of the cell?
At what rate does the cell wall need to break down its carbohydrate structure to
meet the high energy needs of the cell?
Answer:
At what rate do the mitochondria of the cell need to convert glucose to usable
energy molecules to meet the high energy needs of the cell?
Explanation:
Organelles are organ-like structures found in cells. The are responsible for the specific actions carried out by each cell. Each organelle has its own specific role to play. However, missing or damaged organelles can have effects on the cells.
Mitochondria are organelles found in cells of all eukaryotic living organisms e.g animal, plants as they are responsible for the synthesis of energy in form of ATP. Since the cells being investigated in this question is a MUSCLE CELL, which is only found in animals, then an appropriate organelle must be investigated.
The appropriate to be asked to know if muscles cells are functioning properly is: At what rate do the mitochondria of the cell need to convert glucose to usable energy molecules to meet the high energy needs of the cell?.
Note that, other options are incorrect because muscle cells do not have chloroplast and cell wall, while ribosomes are not site for glucose production.
The most accepted theory regarding the make-up of living things is the _____.
Answer:
cell theory
Explanation:
Which of the following is NOT a principle of the Cell Theory? *
A. Cells are the basic units of life.
B. All living things are made of cells.
C. Very few cells are able to reproduce.
D. All cells are produced from existing cells.
Answer:
C is not a principle of the Cell Theory.
Explanation:
Very few cells are able to reproduce is NOT a principle of the Cell Theory
what is cell theory ?Cell theory is widely accepted view of origin of life on Earth functions, all organisms are made of either single cells or a group of cell create tissues, organs, and organisms.
Three major hypothesis of cell theory are all organisms are made of cells, Second, cells are the building blocks in the creation of tissues, organs, and entire functioning organisms. The third is the cells can only arise from other cells or pre-existing cells.
Two scientists called Theodor Schwann and Matthias Jakob Schleiden first developed the cell theory in the year of 1839, along with Rudolf Virchow another scientist who contributed to the theory.
Schleiden explained that the structural part of a plant was made up of cells and a crystallization process either within other cells or from the outside cells. Theodor Schwann explained that the structures of animals are composed of cells.
The modern cell theory explained some postulates like All living things are composed of one or more cells, arise from pre-existing cells by cell division, fundamental unit of both structure and function in living organisms.
The activity of an organism is the activity of independent cells, Energy flow observed within cells, contain genetic material like DNA and RNA in cell nucleus and cytoplasm.
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Choose the answer that describes biological weathering.
A: lichen growing on rocks
B: salt crystallization forming tafoni
C: stone and boulders moved by water
D: acid in water acting on limestone
Answer:
A. lichen growing on rocks
Explanation:
Lichen growing on rocks and types of bacteria produce chemicals that weather minerals 3 to 4 times faster than normal.
Plants' roots, mosses, and lichen which grow on rocks highly responsible for biological weathering, hence option a is correct.
What is biological weathering?Rocks are biologically weathered by living things like lichens, mosses, and plant roots, among others.
When plants break apart rocks with their roots or root exudates, this is known as biological weathering. The delayed process might have a significant impact on how a landscape is formed.
Mosses and lichens are able to break down the rock on which they grow by producing various acids.
Therefore, lichens and non-vascular plants can speed up the weathering of the rock they grow on significantly, hence option a is correct.
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Describe one reason why the solvent property of water is so important for living organisms (nature).
Answer:
Water is known as a universal solvent as it allows for lots of salts and gases to dissolve in it. Water is found between living tissues. This helps for vitamins, minerals and gases to dissolve in the cell. Because of this, the cell lives as it gets glucose and oxygen needed for respiration(to produce energy) .
Also water helps in transport of substances around the body.
The solvent property of water is very important for living organism due to its high dissolving power.
The solvent property of water is very important for living organisms because water dissolve large number of solutes in it and helps in the transportation from one place to another. Water is a polar substance which dissolves polar solutes in itself.
Water dissolve nutrients in itself and transport to the regions where it needed the most so we can say that the solvent property of water helps in the transportation of nutrients and other substance in the body of organisms.
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Select all answers that reflect contributions molecular approaches have made to modern taxonomy. Check All That Apply revealed that ssu rRNA is highly conserved so can be used for classificationrevealed that ssu rRNA is highly conserved so can be used for classification have led to the development of a new taxonomic system divided into domainshave led to the development of a new taxonomic system divided into domains have not changed the overall tree of lifehave not changed the overall tree of life revealed that archaea are more closely related to prokaryotic than eukaryotic cells
Answer:
- revealed that rRNA is highly conserved so can be used for classification
- have led to the development of a new taxonomic system divided into domains
Explanation:
The ribosomal RNA (rRNA) genes are widely used in evolutionary, phylogenetic, and phylogeographic studies as molecular markers because they represent nuclear genes that are highly conserved between species. However, it is important to highlight that rRNA genes form arrays at specific chromosomal sites, thereby they often exhibit pseudogenes that may interfere with their use as molecular markers (i.e., they produce multiple bands in the electrophoresis gel). In 1977, Carl Woese showed that Archaea is an evolutionary lineage separated from Bacteria by using molecular evidence based on an rRNA molecular marker (16S rRNA). Thus, Woese indicated that Eukarya, Bacteria and Archaea represent three different domains that arose separately from an evolutionary ancestor named 'progenote'.
What relationship does Organism Y have with the other organisms in figure 1?
1. It is the herbivore that feeds on autotrophs.
2. It is the producer that provides the food base.
3. It recycles nutrients by breaking down organic matter.
Based on the information in the graph, choose the statement that best describes the reaction it depicts. A. The reaction absorbs energy. B. The reaction releases energy. C. The reaction fails to proceed because of insufficient energy. D. The reaction fails to proceed because it does not involve an energy change.
Answer:
The answer is B the reaction releases energy.
Explanation:
As per the graph, the reaction will release energy. The correct option is B.
What is exothermic reaction?A heat-producing task is an exothermic process. This heat is conveyed to the external environment. Endothermic processes require heat to be supplied to the system from outside the system.
Exothermic reactions are heat-producing chemical reactions. When heat flows from the system to the surroundings, the heat flow q is negative. Exothermic reactions, therefore, have a negative enthalpy of reaction.
Thus, the correct option is B.
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A factor that does not change in an experiment is the
A.Controlled variable
B. Data
C.Inconstant
D.Independent variable
4. If a galaxy is moving towards us, what would happen to the wavelengths of light that we see? How
would that change what we see?
Answer:
Redshift and blueshift describe how light shifts toward shorter or longer wavelengths as objects in space (such as stars or galaxies) move closer or farther away from us. ... When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer.
Are your body cells (e.g., red blood cells, muscle cells, or skin cells) eukaryotic or prokaryotic cells? Please support your answer.
Answer:
eukaryotic, because our body cells have nucleus and membrane-bound organelles
Which cell type undergoes terminal differentiation?
A-epithelial cells
B-stem cells
C-heart cells
D-hair cells
Stem cells are the cell type that undergoes terminal differentiation.
STEM CELLS:
Stem cells are cells in animals that are capable of differentiating into any cell type. Differentiation of a cell implies that the cell becomes more specific in its function. Stem cells undergo mitotic division to produce one daughter cell that is a stem cell and another daughter cell that has differentiated. Stem cells undergo terminal differentiation into specific cell types such as epithelial cells, muscle cells, heart cells, hair cells, blood cells etc. Therefore, stem cells are the cell type that undergoes terminal differentiation.Learn more at: https://brainly.com/question/11161299?referrer=searchResults
Why don't we have a genome sequenced from Homo erectus?
(a) There isn't enough research funding to pay for it.
(b) DNA degrades over time and the fossils are too old.
(c) H. erectus DNA is too similar to ours to prevent contamination.
(d) No H. erectus fossils have been found in Germany, which is where the lab is located.
(e) None of the above; we do have a sequenced genome of H. erectus.
Answer: Homo erectus DNA is too similar to ours to prevent contamination.
Explanation:
Homo erectus fossils are known as the oldest form of early humans that had human like body structure with shorter arms and elongated legs and shorter arms. These features gave them the ability to walk and also run long distances.
The reason that we do not have a genome sequenced from Homo erectus is that their DNA is too similar to ours to prevent contamination. There are enough fund which could have been used to carry out the research but their similarities to human beings has been the source of concern.
According to the article, what are the problems with monoculture farming? Your answer should be written in sentences and not constructed as a list.
Answer:
In addition to overproduction, industrial monoculture predisposes farms to pest problems. To keep up with intensified production, farmers increased pesticide and fertilizer usage, crop density, and the number of crop cycles per season, but decreased crop diversity
Explanation:
Monocultures lack other plant and animal species that limit the transmission of disease and manage pests through predation, which increases the danger of disease and pest outbreaks.
What is monoculture farming?One variety of crop is grown at a time on a particular field in a practice known as monoculture farming. A poly culture system, in contrast, presupposes that two or more crops are sown in a field at once.
Because monoculture farming has the potential to disrupt the natural soil balance, it is not sustainable.
The soil moisture is unstable in a typical monoculture situation. Due to the increased need for water to irrigate crops, water sources including rivers and reservoirs are being unevenly drained.
Therefore, monoculturing is not suitable.
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atmosphere is a mixture of two things
Answer: yes
Explanation:
It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
A basic solution will have
O a low hydrogen ion concentration and a high pH.
O a low hydrogen ion concentration and a low pH.
O a high hydrogen ion concentration and a low pH.
O a high hydrogen ion concentration and a high pH.
Answer:
a low hydrogen ion concentration and a high pH
5 On his voyage on the HMS Beagle, Darwin saw fossils of giant sloths whose bones resembled bones of living sloths, but were much larger in size. Darwin hypothesized that the fossil sloths were related to sloths alive today. This hypothesis was based on (1 Point)
Answer:
A: observation and inferences
and on this one I am 100% sure it is right
Explanation: