An example of a trophic cascade is when Zebra mussels are brought into the Great Lakes,
where there is no natural predator, so the native
species numbers dwindle because the Zebra
mussels have no natural predators.
Wolves are taken out of Yellowstone and as a result,
deer numbers increase, tree nunbers decrease, and
river banks erode, causing the rivers to change
course.
There is not enough food for black bears to eat, so
they get into garbage and get sick.

Compare and contrast nutrient limitation in soil vs. nutrient limitation in aquatic ecosystems

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?

During the process of two rails or sides break apart and attract new nucleotide bases to form a new and complete strand.