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animal wastes (particularly urine) that contain materials high in nitrogen.
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
muscle found only in the heart and forming the muscle wall (myocardium) of the heart.
a liquid-filled body cavity formed within the mesoderm of some animals. The cavity occurs...
two or more forms of a particular chemical element, that have the same number of protons in the...