Which of the Following is Not Properly Paired

Question

Which of the following is not properly paired?
A)seminiferous tubule-cervix
B)Sertoli cells-follicle cells
C)testosterone-estradiol
D)scrotum-labia majora
E)vas deferens-oviduct

Accepted Answer

The seminiferous tubules are part of the male reproductive system, while the cervix is part of the female reproductive system. They are not properly paired.