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blood vessel that supplies the heart muscle with blood.
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
a small finger-like blind-ending extension of the mammalian large intestine connected to the...
a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...
two species that interact symbiotically in a relationship that is beneficial to both species....
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.