At what developmental stage does the conceptus reach the uterus?

A. Zygote
B. Trophoblast
C. Embryo
D. Morula
E. Blastocyst


Answer: D

Anatomy & Physiology

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Lou asks Mark, a cobbler and shoe salesperson, to repair a pair of work boots. There is no discussion of a price, and Lou and Mark do not sign any documents. After the repair, Mark hands Lou a bill. With respect to Lou's obligation to pay the bill, this is

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