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a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
structure surrounding plan tcells i tgives cells rigidity and strength.
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...