Which Statement About Gastrulation Is True

Multiple Choice

Which statement about gastrulation is true?

A) In frogs, gastrulation begins in the vegetal hemisphere.
B) In sea urchins, gastrulation produces the notochord.
C) In birds, cells from the surface of the blastodisc move down through the primitive groove to form the hypoblast.
D) In mammals, gastrulation occurs in the hypoblast.
E) In sea urchins, gastrulation produces only two germ layers.