Apopulation of tree-climbing lizard live on one bank of a large river. the other bank of the river is a treeless prairie. during a flood, 40 lizards were transferred to the prairie side of the river. after 200 generations, this transferred population of lizard lost the ability to climb. which mechanism is most likely responsible for this loss of function within the transferred population?
a) mutation
b) genetic drift
c) natural selection
d) gene flow

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?