What is the last stage of a human fertilized egg?

In the context of human development, the last stage of a fertilized egg refers to the processes that occur after fertilization until birth. The correct answer focuses on the embryonic stage, which is crucial as it encompasses the early development of the fertilized egg into an embryo. During this stage, key structural formations and organogenesis occur, laying the foundation for subsequent stages of development.

The embryonic stage is characterized by rapid cell division and differentiation, where the zygote (the fertilized egg) develops into a multi-cellular structure known as an embryo. This phase is critical since it sets the groundwork for all the major body systems and structures, including the heart, brain, and internal organs. This period lasts until around eight weeks of gestation when the embryo transitions into the fetal stage.

Understanding the stages of prenatal development is essential, as each phase reflects significant changes and development that lead to a viable human being. The final stages involved, after the embryonic stage, are the fetal stage, where the fetus continues to grow and develop until birth. Each of these stages, including the neonatal stage which follows birth, serves distinct roles in the overall development process.