Examlex
We live in the __________ eon.
Placenta
A structure that forms within the uterus throughout pregnancy, supplying oxygen and nutrients to the developing fetus while eliminating waste substances from the fetus's bloodstream.
Germinal Stage
The initial two weeks of prenatal development after conception, characterized by rapid cell division and the beginning of cell differentiation.
Embryonic Stage
A period of prenatal development from the second to the eighth week after conception, where major body structures and organs begin to form.
Fetal Stage
The fetal stage refers to a period in human development that begins during the 9th week of pregnancy and continues until birth, characterizing rapid growth and development of the fetus.
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