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| subject to different laws of growth or specialization |
| the series of living phenomena exhibited by an organism in the course of its development from inception to death |
| any modern theory of evolution holding that species evolve by natural selection acting on genetic variation |
| a taxonomic group of organisms classified together on the basis of homologous features traced to a common ancestor |
| transfer of information from one cell or molecule to another, as by chemical or electrical signals |
| single-celled colonial algae occurring in soil and on moist rocks and vegetation and also as a slime or scum on ponds and stagnant waters |