A) planktons
B) nektons
C) pleustons
D) sestons
Correct Answer: A
Solution :
Planktons are any drifting organisms (animals, plants, archaea or bacteria) that inhabit the pelagic zone of oceans, seas or bodies of fresh water. Planktons are defined by their ecological niche rather than phylogenetic or taxonomic classification. They provide a crucial source of food to larger, more familiar aquatic organisms such as fish and Cetacea.
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