Protists that decompose dead organisms like insects are called

a. dinoflagellates.

b. euglenoids.

c. plasmodial slime molds.

d. water molds.

c. It is prokaryotic.

d. It is autotrophic.

The answer is (d.) water molds.

The water molds are fungal-like protists that thrive on dead organism to decaying matter to decompose. They are usually found in wet environments, nearby fresh water sources, and even in the upper layers of moist soils.