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an artificial device that helps to stimulate and regulate the heart muscle.
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
is the passing of traits to the offspring from its parents or ancestors. The study of heredity...
tough connective tissue found in conjunction with muscle, cartilage and bone.
process whereby excess amino acids are broken down in the liver to form urea.
tissue that makes up the majority of the plant body and performs various functions.