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undifferentiated cells found in almost all organisms that have the ability to develop into any kind of cell or tissue.
(also called heterotrophic organisms) organisms that are not able to produce their own organic...
a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...
is the passing of traits to the offspring from its parents or ancestors. The study of heredity...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
(also called secondary thickening) growth due to new cells being formed by the secondary...