The ____ is a time during which organ systems are refined and begin to function.

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The fetal period is the time during which organ systems are refined and begin to function. This period begins at the ninth week of gestation and continues until birth. The embryonic period is the time during which the major organs and structures of the body are formed, and it occurs during the first eight weeks of gestation. The period of the zygote refers to the very early stages of development, before the embryo has implanted in the uterus. Implantation is the process by which the embryo attaches to the wall of the uterus and begins to receive nourishment from the mother's blood supply.

The ____ Is a Time During Which Organ Systems Are