Why Was the Evolution of the Extraembryonic Membranes Crucial for Colonization

Multiple Choice

Why was the evolution of the extraembryonic membranes crucial for colonization of land by the vertebrates? Extraembryonic membranes ________.

A) provide an aqueous environment for embryo development
B) provide nutrients that produce energy for development
C) direct morphogenesis within the embryo
D) give rise to crucial organ systems, like the heart and brain