Question

30 POINTS!!!!!!!!!!!1
Which of the following lists the events occurring during development in the correct sequence?

A. Placenta formation; gastrulation; differentiation of tissue layers; chorion formation
B. Chorion formation; placenta formation; gastrulation; differentiation of tissue layers
C. Differentiation of tissue layers; gastrulation; placenta formation; chorion formation
D. Gastrulation; differentiation of tissue layers; chorion formation; placenta formation

Answer 1

My guess is D, but I am not completely confident about my answer.

Answer 2

Answer:

It is letter D, i just took the quiz.

Explanation: