is the proportion of observable differences in a group that can be explained by differences in the genes of the group's members.

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the answer for this question would be d. glaciers

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .