In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Achange in direction without a change in speed is called velocity

Why is it bad that some cancer cells can make their own growth hormones?