Which of the following is an example of chemical potential energy? a. a person swinging a bat b. an unlit match c. a stretched rubber band d. a boulder on a hill

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

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.

20 how are energy cycles and growth cycles related?