Question

multiple choice question although oxygen content generally decreases with increasing depth in the ocean a noticeable reverse in the trend occurs around 800 meters. why? there are a lot more photosynthesizing organisms at depth. oxygen gas bubbles up from the oceanic crust. there is a significant drop in the number of animals that are using oxygen

Explanation:

Photosynthesizing organisms produce oxygen. At shallower depths, there is more light for photosynthesis. Around 800 meters, the light - dependent photosynthesis decreases significantly, reducing oxygen production. But below this depth, other processes like respiration of deep - sea organisms consume oxygen at a relatively lower rate compared to shallower depths where both production and consumption are high. Also, decomposition of organic matter at these depths can release carbon dioxide and consume oxygen, but the overall balance leads to a reversal in the oxygen - depth trend as oxygen consumption slows down relative to shallower regions.

Answer:

There are a lot more photosynthesizing organisms at shallower depths.