STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Amoeba protozoa. Coloured scanning electron micrograph (SEM) of four Amoeba sp. protozoa, showing their numerous pseudopodia (cytoplasmic extensions, leg-like). These freshwater single-celled organisms feed on bacteria and smaller protozoa. They use their pseudopodia to engulf their food and for locomotion. Magnification: x 120, when printed 10 centimetres wide.
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