Final answer:
The pathway of sperm entering the female reproductive system is: vagina, uterine tube, cervical canal, external os, uterine cavity, internal os.
Step-by-step explanation:
The correct arrangement of the pathway of sperm entering the female reproductive system is 6, 3, 4, 2, 1, 5. This means that the sperm enters the vagina first (6), then travels through the uterine tube (3), followed by the cervical canal (4), the external os (2), the uterine cavity (1), and finally, the internal os (5).