The final aspect of the nitrogen cycle is the process of denitrification. In that process, varies organism like microscopic bacteria, and fungi decompose the nitrate in the soil into nitrogen gas which they release into the air.
From https://www.cas.miamioh.edu/mbi-ws/biogeochemicalcycles/Nitrogen/nitrogen.htm
Answer:
A "red tide" is a common term used for a harmful algal bloom. This bloom, like many HABs, is caused by microscopic algae that produce toxins that kill fish and make shellfish dangerous to eat. The toxins may also make the surrounding air difficult to breathe.
Explanation:
It is the baby's life support system and breathing organ while in the womb. The placenta allows oxygen and nutrients to move from the mothers blood to the fetus' blood.