Explain how the lungs and circulatory system work together? The lungs help with pumping of blood throughout the body.

The lungs take in oxygen into the body and the blood distributes oxygen to cells throughout the body.

The lungs take in carbon dioxide and blood distributes it to cells in the body.

Waste product from the blood is expelled out of the body through the lungs.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.