Question

part 3 is very important for the embryo.why?
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Answer 1

Explanation:

During Stage 3 the embryo separates into outer trophoblast cells and inner embryoblasts (inner cell mass) that will develop into the embryo proper. ... In vitro studies have shown that Stage 3 embryos go through four characteristic processes: 1) cavitation, 2) collapse/ expansion 3) hatching and 4) discarded cells.