The formation of the yolk sac happens at what week of embryonic development?

The endoderm forms which of the following tissue types?

At what point in a pregnancy is miscarriage most likely to occur?

Which of the following is not one of the three basic germ layers formed during embryonic development?

Which of the following tissue types is not derived from the mesoderm?

The process by which an embryo develops from a single celled zygote into a complex organism with many cell and tissue types is called:

At what embryonic age does the neural tube form?

The initial single-celled fertilized egg is known as the __________.

__________ is the fetal structure that allows approximately 20-30% of blood to bypass the liver and flow from the umbilical vein to the vena cava.

Fertilization generally occurs in what location?