Phytoplankton form the base of food webs, but are only present in the upper few hundred meters of the ocean. a number of factors here can limit their growth and hence limit the amount of biomass in higher trophic levels.

which of the items below is not one of these limiting factors to phytoplankton?

a. nitrogen

b. light

c. phosphate

d. oxygen

The correct answer is d. Oxygen

Explanation:

Phytoplanktons are responsible for the fixation of approximately half of the global carbon therefore seawater has high CO2 concentration which is required by phytoplanktons to make their food.  

They are the primary producers of oceans and they are responsible to support the food chain of oceans. Factors that can limit their growth are mainly sunlight and nutrients like phosphorus, nitrogen, etc.

As phytoplanktons are photosynthetic they release oxygen itself as a byproduct therefore oxygen is not a limiting factor to phytoplanktons. So the right answer is d.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation:

the answer you are looking for is the united states forest service.

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