Plankton, for the most part, are actually single-celled algae, that use photosynthesis to generate the energy they use (although zooplankton, which are still in the same family as plankton, can be larger and even feed off of plankton.) Krill, on the other hand, are crustaceans, with a shell, segmented bodies, and antennae. Both species are extremely important building blocks for life in the world’s oceans
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