Those organisms that remain planktonic for their whole lives are called:

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Holoplankton are organisms that remain planktonic for their entire lives. Meroplankton, on the other hand, are organisms that start their lives as plankton but later become nekton or benthos. Nanoplankton and seston refer to the size of the planktonic organisms and particles, respectively. Nekton are organisms that are capable of swimming against currents, such as fish or whales.

Those Organisms That Remain Planktonic for Their Whole Lives Are