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the tough connective tissue membrane surrounding bones on the outside. It contains nerves and blood vessels.
plant-like organisms that live and grow in water; they make their own organic food by the...
(also called polymers) large, more complex molecules formed when monomers join together.
small fluid-filled sacs that store, transport, or digest cellular products and waste.
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.