A Researcher Interested in Studying Development and Function of the Allantois

Multiple Choice

A researcher interested in studying development and function of the allantois in a vertebrate wants to select a species with a relatively large allantois.A good recommendation would be to

A) study humans.
B) avoid chicks because they lack this particular extraembryonic membrane.
C) find a species of placental mammal whose placenta is not very effective at clearing nitrogenous wastes.
D) select a species in which ectoderm makes a large contribution to the allantois.
E) find a species of placental mammal whose placenta is particularly effective at clearing nitrogenous wastes.