Biology Forums - Study Force

In a frog embryo, gastrulation     
A) occurs along the primitive streak in the animal hemisphere.
B) is impossible because of the large amount of yolk in the ovum.
C) proceeds by involution as cells roll over the lip of the blastopore.
D) occurs within the inner cell mass that is embedded in the large amount of yolk.
E) produces a blastocoel displaced into the animal hemisphere.

C