Alake community with four trophic levels suddenly suffers from algal blooms. using the strategy of biomanipulation, an ecologist may propose

Why did large numbers of african migrate to the americas

Acounterculture is composed of a group of people who the dominant culture.

Which are results of technological advances? increased people's exposure to new ideas created a global culture valued by people around the world brought harmony to diverse groups of people reduced the number of people living in rural areas