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a ring of muscle that controls the passage of substances through a tube or body opening.
a process of asexual reproduction in which one cell splits into two cells
movement of the Earth's continents as the Earth's tectonic plates shift.
symbiosis where one organism lives on another (on the outside of another).
biological classification group (taxon) that is divided into species (the plural of genus is...
a fine thread-like structure. In plants: the stalk of the male sexual organ.