Any substance that occupies space and has mass (weight).
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Solids have a definite size (volume) and a definite shape.
Liquids have a definite size (volume) but not a definite shape.
Gases do not have a definite size (volume) or a definite shape.
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Kidneys excrete urine
Liver discharges bile
Skin eliminates perspiration
Large intestine eliminates decomposed and undigested food
Lungs exhale carbon dioxide
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The science that deals with the composition, structure, and properties of matter and with how matter changes under different conditions.
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Can cause premature aging and wrinkling of the skin. Nicotine in tobacco causes contration and weakening of the blood vessels and small capillaries that supply blood to the tissues, causing decreased circulation. Eventually the tissues are deprived of essential oxygen. Skins surface may appear yellowish or gray in color and can look dull.