Question

Anne has been observing human embryos in different stages. She wants to study the gastrula phase. How will she find it?

by looking for the presence of the neural tube and the notochord in the embryo

by looking for the presence of the germ layers and the primitive gut in the embryo

looking for the presence of the heart and lungs in the embryo

Answer 1

By looking for the presence of the germ layers and the primitive gut in the embryo.

Answer 2

I think anyways. I know that there are three germ layers in the gastrula phase, but I'm not sure about the primitive gut part. Where there any other choices?

Answer 3

B