When we see chiasmata under a microscope, that lets us know that prophase I has occurred. During this phase of meiosis, the nuclear envelope breaks up and disappears, and so does nucleolus. The chromosomes become visible at this point.
Yes. Absolutely. Without heart, no one can live. It helps in pumping of oxygen rich blood to all body cells and tissues. It also helps in transportation of various materials like potassium, sodium, calcium etc. in our body. The main function is that it helps in excretion of wastes.
Since blood is liquid and heart pumps it, the waste materials like CO2, gets diffused and becomes impure blood. Then it is taken to lungs for purification and again reused.
So, heart actually helps us indirectly in many ways.
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Answer:
B: A population's environment or location changes, some members survive and reproduce, and favorable trails are passed on to offspring
Explanation:
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Answer:
c. No, because his speed is a result of diet and exercise, not a genetic trait.
Explanation:
Natural selection is the differential survival and reproductive success of some individuals of a population. This is attributed to the presence of beneficial genetic variations in them. Natural selection always targets the adaptive genetic traits. In the given example, a specific diet and exercise led to increased fitness and survival chances of Jumping Jack Flash. Diets and exercises are not genetic traits on which natural selection can be operative. Therefore, it is not an example of natural selection.
Water
Water is the substance that plays a major role in most of the chemical reactions that occur in living cell.
Water is a clear, tasteless, and odourless substance that is found in high amounts in living organisms, and is required by all forms of life. Water plays a major role in most of the chemical reactions that occur in living cells. Water is present both within and outside cells, and almost all chemical reactions take place in water solution. Water also acts as metabolite in many chemical reactions. It is either a reactant or a product of reaction. Water is involved in chemical processes such as digestion, photosynthesis, and aerobic respiration.