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Reverse Search
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| external respiration |
the exchange of carbon dioxide and oxygen across external or respiratory surfaces, such as gills, in multicellular organisms. |
| nervous system |
the system of nerves and nerve centers in most multicellular animals. |
| pseudopod |
a temporary protrusion of the protoplasm in certain one-celled organisms or in certain cells of some multicellular animals, used like a foot in locomotion or like a hand to grasp food. |
| rotifer |
any of a group of mostly freshwater, microscopic, multicellular organisms that have one or more wheel-like rings of cilia at the front end which appear to rotate when vibrated. |
| stem cell |
a type of undifferentiated cell found in embryos or bodies of multicellular organisms, which reproduces by division and has the potential to become a specialized cell, such as a brain, muscle, blood, or bone cell. |
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