Which features set most of the members of protista apart from the rest of the kingdoms

Unicellular and microscopic features set the protista apart from the rest of the kingdom.

Explanation:

Protista are eukaryotic organisms that are neither plants, animals or fungi. They do not have a natural group with whom they share common ancestor. They have a unique features that set them apart from the rest of the kingdom which are unicellular and microscopic. Examples are amoeba, blue green algae, diatoms, green algae, ciliates and many more.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

carbon

explanation: