When is a conceptus considered to be an embryo?

A. When the trophoblast and embryoblast have differentiated from each other
B. As soon as the first traces of all the organ systems are present
C. When the three primary germ layers have formed
D. When the egg is fertilized by the sperm
E. After the conceptus has implanted in the uterine wall


Answer: C

Anatomy & Physiology

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