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The blastopore is a structure that first becomes evident during

a. the eight-cell stage of the embryo.
b. coelom formation.
c. fertilization.
d. cleavage.
e. gastrulation.

I think that it is (e). But I am kinda thinking that it could be (d) too. PLEASE HELP!

  • biology -

    e. gastrulation is correct.

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