Racial differences in skin color are due to different people having different numbers of melanocytes.
a. true
b. false
Answer: b. false
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Which of the following is incorrectly paired?
a. mesoderm—muscle b. endoderm—skin c. ectoderm—feathers d. mesoderm—circulatory system
An animal's somatic cells contain 2n chromosomes. What happens to the number of chromosomes in the animal's gametes?
A. the number is reduced to n by mitosis B. the number is reduced to n by meiosis C. the number is increased to 4n by mitosis D. the number is increased to 4n by meiosis
What are the typical shape, color, and nectar content of a flower that is pollinated by a hummingbird? What are the traits of a bee-pollinated flower?
What will be an ideal response?
Under what conditions would you expect a plant to have the highest concentration of abscisic acid (ABA)?
A) wet tropical rain forest B) cool environment after a heavy rain C) houseplant growing in low light conditions D) desert after a long drought