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a foreign substance, usually a protein, that stimulates the production of one or more antibodies. The foreign substance, which could be a virus, bacterium or toxin, can be from the external environment or from within the body.
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
(also called macromolecules) large, more complex molecules formed when monomers join together....
consists of the pectoral and pelvic girdles together with the arms and legs.
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...