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muscles that work in pairs and are responsible for causing movement in opposite directions in the same joint.
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
a thick layer inside the primary cell wall. It consists mainly of cellulose, hemicellulose and...
a biological classification group (taxon) that is divided into families.
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...