Which best describes the path of solar radiation?

a. from the surface of the earth to the sun, where it is absorbed
b. from the sun to the surface of the earth, where it is absorbed or reflected
c. from the surface of the earth to the sun, where it is absorbed or reflected
d. from the sun to the surface of the earth, where it is reflected

The part of a desired plant inserted into rootstock during grafting is called the

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?