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a proposed scientific explanation for a set of observations

cell culture

group of cells that form from a single cell


information gathered from observations


change over time

metric system

A decimal system of measurement whose units are based on certain physical standards and are scaled on multiples of 10


process of keeping internal conditions fairly constant

cell fractionation

a technique to separate the different cell parts


device that produces magnified images of structures that are too small to see with the unaided eye


science that seeks to understand the living world


well-tested explanation that unifies a broad range of observations

natural selection

a natural process resulting in the evolution of organisms best adapted to the environment

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