Question

1. in extreme cases, eutrophication can lead to extremely low levels of oxygen in a body of water as decomposers break down all the dead producers, a condition called

a. hypoxia.
b. nitrogen fixation.
c. respiration.
d. photosynthesis.

Explanation:

Hypoxia is a condition of low - oxygen levels. Nitrogen fixation is about converting nitrogen gas to other forms. Respiration is the process of using oxygen to release energy. Photosynthesis is the process of making food using light energy. In eutrophication, when decomposers break down dead producers, oxygen levels drop leading to hypoxia.

Answer:

A. hypoxia