Examlex
The STDVAR function is used to determine the standard deviation of numeric data.
Million Years
A unit of time equal to one million years, often used to describe geological and evolutionary time scales.
Bilateral Symmetry
A body shape with right and left halves that are approximately mirror images of each other. Compare with radial symmetry.
Cephalization
The evolution of a head; the concentration of nervous tissue and sense organs at the front end of the animal.
Natural Selection
The process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well-adapted organisms.
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