In an aquatic environment, microscopic animals and plants are collectively known as
-
commensales
-
herbivores
-
fauna and flora
-
planktons
D
Correct answer
Explanation
Plankton is the collective term for microscopic organisms floating in aquatic environments. It includes both phytoplankton (plant-like) and zooplankton (animal-like), making it the correct answer. The other options are incorrect: commensales describes a symbiotic relationship, herbivores are plant-eating animals, and fauna and flora refers to larger animals and plants rather than microscopic organisms.