Hall believed that each individual in his or her lifetime reenacted all of the evolutionary stages of the human species. what is this idea called?

The correct answer is: Recapitulation Theory.

Explanation:

The Recapitulation Theory began as an idea by Étienne Serres in the 1820s that later, in 1886, was took by Ernst Haekel when he proposed his "Ontogeny recapitulates phylogeny" theory. Recapitulation Theory combines evolution and embryology and states that the development of an individual when an embryo, summarizes the evolutionary history of its species.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

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