Assertion: plankton | /r/HasAspect | two main groups
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Source sentences:
text: Plankton are comprised of two main groups, permanent members of the plankton called holoplankton such as diatoms, radiolarians, dinoflagellates, foraminifera, amphipods, krill, copepods & salps and temporary members such as most larval forms of sea urchins, sea stars, crustaceans, marine worms, some marine snails and most fish which are called meroplankton.