The stage of development that begins at fertilization and lasts for 16 days is called the

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Quizplus · Accepted Answer

The pre-embryonic stage begins at fertilization and lasts for approximately 16 days. During this stage, the zygote undergoes several cell divisions and eventually forms a blastocyst, which will implant in the uterine lining and begin the embryonic stage. The embryonic stage begins at implantation and lasts until the end of the 8th week of development. Therefore, choice B (zygotic stage) is incorrect, as it only refers to the very early stages of development before any cell division has occurred. Choice A (fetal stage) is also incorrect, as it occurs much later in development, beginning at the 9th week and lasting until birth. Choice C (embryonic stage) is partially correct, as it follows the pre-embryonic stage, but it begins at implantation, not fertilization.

The Stage of Development That Begins at Fertilization and Lasts