The fertilized egg begins a rapid descent to the uterus. The period of rest in the tube appears to be necessary for full development of the fertilized egg and for the uterus to prepare to receive theegg. ... At the end of this transition period, the embryo becomes a mass of very organized cells, called a blastocyst.
The best answer among the following choices to fill in the blank would be A).
Answer:
the correct answer would be D
Explanation:
A. Osmosis is the answer for this question
