(D) During human embryonic development, the embryo reaches a length of approximately $1\, \text{inch}$ (about $2.5\, \text{cm}$) by the end of the $8^

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(D) During human embryonic development, the embryo reaches a length of approximately $1\, \text{inch}$ (about $2.5\, \text{cm}$) by the end of the $8^{th}$ week of gestation. At this stage, the embryo is referred to as a fetus, as most of the major organ systems have begun to form.