Final answer:
The egg or embryo takes about a week to travel through the fallopian tube and into the uterus. The movement is facilitated by the beating of the cilia and contractions of smooth muscle.
Step-by-step explanation:
The egg or embryo takes about a week to travel through the fallopian tube and into the uterus. The movement is facilitated by the beating of the cilia, which are hair-like structures that line the outside and lumen of the fallopian tube. The cilia beat in a coordinated manner, along with the contraction of smooth muscle, to move the egg along. Therefore, the correct answer is C) 7 days.