How does bacterial decomposition benefit the biosphere?

Question

How does bacterial decomposition benefit the biosphere?

A. It provides a steady source of oxygen that aerobic organisms need to breathe.
B. It enables plants to use nitrogen from the soil
C. It helps reduce the size of the ozone hole.
D. It returns carbon from once-living organisms to the atmosphere in the form of CO2.

Answer 1

B. It enables plants to use nitrogen from the soil

Answer 2

B

The bacteria act as decomposers to break down materials and release the nutrients back into the soil.

Legumes (bean family) have bacteria which live in nodules in the roots of the plant. These bacteria can "fix" nitrogen from the air to help fertilize the plant.