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biological classification group (taxon) that is divided into orders.
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
a ring of muscle that controls the passage of substances through a tube or body opening.
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
inter-connecting strands of cytoplasm that connect the cytoplasm of adjacent plant cells across...