Comparative embryology
Encyclopedia
Comparative Embryology is the branch of embryology
Embryology
Embryology is a science which is about the development of an embryo from the fertilization of the ovum to the fetus stage...

 that compares and contrasts embryo
Embryo
An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination...

s of different species.
Sorry yahh but this is incomplete
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