What kingdom does plankton belong to???

Answer 1

All of them:

"Plankton are primarily divided into broad functional (or trophic level) groups:

Phytoplankton (from Greek phyton, or plant), autotrophic pro- or eukaryotic algae that live near the water surface where there is sufficient light to support photosynthesis. Among the more important groups are the diatoms, cyanobacteria and dinoflagellates.

Zooplankton (from Greek zoon, or animal), small protozoans or metazoans (e.g. crustaceans and other animals) that feed on other plankton. Some of the eggs and larvae of larger animals, such as fish, crustaceans, and annelids, are included here.

Bacterioplankton, bacteria and archaea, which play an important role in remineralising organic material down the water column (note that many phytoplankton are also bacterioplankton)."

Answer 2

I THINK it's a protist. Aren't they the ones that are unicellular, but they sort of act like plants, animals, or fungi, like maybe we all evolved from them?