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(genetic biology)

Grammar: noun
Definition:
~ a continuing process of change from one state or condition to another, or from one form to another

~ a change in the genetic composition of a population during successive generations, through natural selection, resulting in the development of new species
Example:
1. The theory of evolution contends that groups of organisms change over time, mainly as a result of natural selection, so that descendants differ morphologically and physiologically from their ancestors.

2. Major evolutionary changes can take place very rapidly, with little alteration in the DNA e.g. the Cambrian radiation.
Related Word: evolve (verb), evolutionary (adjective)