List four ways to sensation in animals. How does it help living beings?​

Which medullary index indicates a human hair? a. 0.653 b. 0.733 c. 0.516 d. 0.256

What are two examples of conduction that we use everyday

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.