tki6nshamengarce tki6nshamengarce

09-04-2017
Biology

contestada

A blastula is
a. the innermost germ layer.
b. a hollow ball of cells in an embryo.
c. a digestive organ.
d. a stage of development before a zygote.

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skylargardner20 skylargardner20

16-04-2017

B) a hollow ball of cells

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