In bird embryos, the pathway for cell migration into the blastocoel is formed by the ____, while in frog embryos, the
pathway for cell migration into the blastopore is formed by the ____.
a. archenteron; dorsal lip of the blastopore
b. epiblast; dorsal lip of the blastopore
c. primitive groove; ventral lip of the blastopore
d. primitive groove; dorsal lip of the blastopore
e. hypoblast; ventral lip of the blastopore
ANSWER: d
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