The Oceans not only host large predators such as sharks or orcas. Even in the realm of the microscopic, some unicellular species consume others. Choanoflagellates belong to these unicellular predators. They are widespread in the ocean and eat bacteria and small algae. Choanoflagellates are considered among the closest living unicellular relatives of animals and can transition to a multicellular state. For that reason they are often studied for understanding how multicellular organisms like us came to be.
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Source: Phys.org