In the embryonic stage,the brain begins to undergo rapid development,which causes the head to represent about ____ of the total length of the embryo.

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During the embryonic stage of development, the brain experiences rapid growth and allows the head to represent approximately 50% of the total length of the embryo. This is known as cephalization and is a characteristic feature of all vertebrates during embryonic development.

In the Embryonic Stage,the Brain Begins to Undergo Rapid Development,which