Embryonic development review (article) | Khan Academy
https://www.khanacademy.org/science/how-does-the-human-body-work-class-12/x7babbc170453fdb8:human-reproduction/x7babbc170453fdb8:fertilization-pregnancy-and-embryonic-development/a/embryonic-development-review
WebKey terms. What happens during pregnancy? Have you ever wondered why a typical human pregnancy lasts about 9 months? What goes on in there? Do all animals carry their babies for 9 months? 20 22. The embryo develops within the womb during this period. First, stem cells in the inner cell mass of the implanted blastocyst begin to differentiate.
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