What is the link between nitrogen cycle and phosphorus cycle?

Decomposition of biological waste by microbes can return nitrogen to the atmosphere. Nitrogen is mainly used by humans as a fertilizer in farmlands, but its excessive usage can lead to serious problems (such as eutrophication). The phosphorus cycle involves the uptake of phosphorus by organisms.

Explanation:

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

during expiration the diaphragm relaxes, which causes the diaphragm to move downwards. the contraction of diaphragm increases the space for expansion of lungs. hence, the diaphragm relaxes and positioned downward during expiration.