- Life Sciences
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.
the tube that carries urine from the nephrons to the ureter via the renal pelvis.
in plants: the structure within a seed that will develop into the new plant.
organelles in which cellular respiration takes place to produce ATP to supply cells with energy...