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tissue that covers the surfaces of the body (the skin) and lines the ducts of the gut.
a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...
the flooding of land, such as the flooding that happens when dams are constructed.
the fluid that circulates through the lymphatic system. It is similar to blood plasma in...
blood vessels that transport deoxygenated blood from the heart to the lungs.