Still wondering how plankton swims?
The open sea is a pelagic ecosystem (Pelagic is a term that refers to a part of the sea or ocean, that is not near the shore nor near the bottom), in wich the living components are plankton an nekton.
Plankton (singular plankter) are a diverse group organisms that includes microalgaes (phytoplankton) -both first gif- and animals (zooplankton) that float along at the mercy of the sea’s tides and currents.
Several structural features and behaviors have evolved to keep afloat organism that are not strong swimmers. some plankton species display a number of interesting adaptation that help them avoid predation. Many planton and nekton swim by cilia, flagella, appendages and undulatory tails
Some are babies (correct term is larva) that will grow into strong-swimming, non-planktonic adults. Others will remain plankton for their entire lives, also jellyfish. Most of the plankton in the ocean are micro-algaes, It is estimated that 80% of the oxygen on earth is produced by phytoplankton.