Which of the following is an example of a learned behavior? A. A bird feeding its young B. Human toddlers walking C. A child recoiling from a hot stove D. Squirrels opening nuts Please select the best answer from the choices provided A B C D.

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.

The process of meiosis produces only gametes, eggs or sperm. according to the diagram, how many sperm are formed from each cell that undergoes meiosis?

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