KARL GAFF / SCIENCE PHOTO LIBRARY KARL GAFF / SCIENCE PHOTO LIBRARY
Euglena swimming among moss leaves, light microscopy footage. Euglena is a single-celled plant-like protist with an oozing, ever-changing shape. Its bright green colour comes from chloroplasts used in photosynthesis. It propels itself with a single, hair-like flagellum located at its leading end. It is attracted to light and finds its way using an eyespot located near the base of its flagellum. Euglena lives in ponds and puddles, creating starch in sunlight and feeding off large organic molecules in the dark.
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