As a Result of Human Agriculture and Urbanization, and More

Multiple Choice

As a result of human agriculture and urbanization, and more recently large-scale phosphorus mining, the amount of phosphorus in Earth's freshwater and terrestrial ecosystems has nearly quadrupled.This suggests that recent increases in algal blooms in many lakes might be occurring because phosphorus

A) is no longer a limiting factor.
B) has become a limiting factor.
C) is no longer entering its major pools.
D) is no longer cycling through organisms.
E) levels on Earth have increased.