Submitted by Nimynn t3_y21axx in askscience
PerpetuallyLurking t1_is3pjsk wrote
Simplicity. An embryo is more simple-celled than the whole baby. It’s much, much easier to successfully freeze a zygote that’s only split into a couple pairs of cells (an embryo) than the millions of cells that a baby consists of (never mind the millions more a grown adult has compared to a baby).
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