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the actions of the body's immune system that work to fight infections or disease.
(also called lithospheric plates) massive, irregularly shaped slabs of solid rock.
the membrane that surrounds the nucleus. It is similar in structure and function to the cell...
a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the...
single-celled algae that have two flagella and are found mainly in seawater but are also common...