Which of the following is an example of a predator adaptation? a. a porcupine’s needles
b. a shark’s powerful jaws
c. a frog’s bright colors
d. a plant’s poisonous chemicals

Which process can increase the rate of greenhouse gas emissions into the atmosphere in response to a decrease in albedo

Does mitochondria still meet the definition of a eukaryote why or why not?

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.