Abird species known as the cattle egret is often found near farms in wet areas. the bird waits, sometimes even perched on a cow's back, until the cow kicks up a frog or fish while it walks. then, the bird strikes and eats the exposed prey. this is an example of what kind of feeding relationship?
a. detritus
b. parasitic
c. mutualistic
d. herbivorous

How does natural selection change thephenotypes within a population over time?

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?

How do living things obtain phosphorus