The longer evolution acts on a population, the variation in forms it can produce. Therefore, when searching for large evolutionary changes in species, biologists often need to search for evidence . Fossils can help biologists reconstruct evolutionary histories by revealing the forms of . fossils can help biologists understand how new groups of organisms arose from very different organisms.

1.—The (more) variations in forms it can produce.

2.—Biologists often need to search for evidence (in the distant past).

3.—By revealing the forms of (extinct species).

4.— (Intermediate) fossils can help biologists

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava

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