Question

multiple choice question
what happens to the approximately 300 million metric tons of excess oxygen produced each year by photosynthetic marine organisms?
it is released into the atmosphere.
it is consumed by bacteria.
it is incorporated into sediments and then eventually formed into rocks.

Explanation:

Photosynthetic marine organisms produce oxygen as a by - product of photosynthesis. The excess oxygen is released into the atmosphere, contributing to the oxygen levels in the air that support aerobic life on Earth. Bacteria do not consume this large amount of oxygen in a significant way compared to the release into the atmosphere, and oxygen is not incorporated into sediments and rocks in this context.

Answer:

It is released into the atmosphere.