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a species that has a large effect on its environment relative to its abundance and plays an important role in maintaining the structure of the ecological community.
hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral...
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
consists of the pectoral and pelvic girdles together with the arms and legs.