Why do some water masses in subsurface oceans have little or no oxygen? a. Large carnivores deplete oxygen in subsurface oceans via their high rates of oxygen metabolism. b. Rates of photosynthesis are low in overlying waters, limiting the availability of oxygen. c. Waters underneath the surface oceans are cold and thus have a limited capacity to carry oxygen in solution. d. Rates of photosynthesis are high in overlying waters, supporting high rates of respiration in waters that deplete the oxygen there.

The Correct option is "D"

Explanation:

By and large there is accessibility of plenitude daylight on a superficial level which gives different tiny fish and diatoms a space to develop, which additionally accommodates thick algal sprout. These algal sprout are obtrusive to such an extent that their thickness may exhaust the oxygen level and furthermore can slaughter the microscopic fishes.

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation: