During which stage of development does a zygote develop into an embryo?

The correct answer is the period described from 2 weeks after fertilization through the second month. This timeframe is critical as it delineates the transition of the zygote into an embryo.

Initially, following fertilization, the zygote undergoes a series of divisions and eventually implants into the uterine wall. This stage encompasses the first couple of weeks after conception, where significant cellular growth and differentiation occur. Once the zygote implants, it officially becomes an embryo and continues to develop through various key processes such as gastrulation, where the three germ layers form, laying the foundational structures for all major organs and systems.

This embryonic stage is crucial as it encompasses significant development milestones, and understanding its timeframe highlights the importance of the early weeks in prenatal development, where critical growth occurs that will impact normal development throughout the rest of gestation.