Figure 11-2 
-In Figure 11-2, what does the structure labelled A represent?
Definitions:
Fetus
A developing human from roughly eight weeks after conception until birth.
Blastocyst
A stage of embryonic development in mammals, occurring roughly five days after fertilization, marked by the formation of a fluid-filled cavity and the differentiation of the embryo into two layers.
Fetal Period
The period in prenatal development from nine weeks after conception until birth, when the brain continues developing, bodily structures are refined, and the fetus grows in length and weight and accumulates fat in preparation for birth.
Germinal Period
The initial two weeks of prenatal development following conception, characterized by rapid cell division and attachment to the uterine wall.
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