What is the per capita growth rate of the global human population? A.) negative
B.) fluctuating
C.) positive
D.) zero

Name one similarity and one difference between the morphology of a brachiopod and a bivalve

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.

Pulmonary arteries carry highly oxygenated blood. true or false?