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More Than 475 Free MCAT Questions with Detailed Answers!

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MCAT Question A Day - 5/21/13

If fertilization usually occurs in the fallopian tubes, and implantation takes place 4–7 days later, what developmental stage actually implants in the endometrium?

A.  Zygote
B.  Solid ball of cells
C.  Hollow ball of cells
D.  Ball of cells with three germ layers