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organs of gaseous exchange in many animals that live in water.
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
deep, narrow holes drilled into the earth to reach the ground water in aquifers.
a biological classification group (taxon) that is divided into families.
an opening between the guard cells.
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...