Vertebrate colonization of terrestrial habitats increased dramatically with the evolution of

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The shelled egg allowed vertebrates to reproduce on land, because it provides protection and nutrients to the developing embryo. This was a key adaptation that enabled the colonization of terrestrial habitats. While the other choices are also important adaptations for living on land, they did not have the same dramatic impact on vertebrate evolution as the shelled egg.

Vertebrate Colonization of Terrestrial Habitats Increased Dramatically with the Evolution