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the main producers in aquatic environments are
a.
phytoplankton
b.
zooplankton
c.
kelp
d.
fish

The correct answer for the blank is- a)  Phytoplankton.

Phytoplanktons are the autotrophic, microscopic organisms ( such as dinoflagellates, diatoms, blue-green algae) that are present in the aquatic enviornments ( both salty and freshwater).

They possess green pigment that is chlorophyll like green plants on land.

They are the main producers in the aquatic environments as they synthesize their own food through the process called photosynthesis, which is then consumed by other organisms ( such as zooplanktons) in the aquatic food chain. By doing so, they form the base of aquatic food chain.

b is dominant over the allele for the white fur.