Final answer:
The reproductive system encompasses accessory glands, gonads, external genitalia, and ducts that transport gametes, hence the answer is D) all of the above.
Step-by-step explanation:
The reproductive system includes accessory glands and organs that secrete fluids, gonads and external genitalia, and ducts that receive and transport the gametes.
The male reproductive system, for example, consists of testes which are the gonads that produce sperm, ducts such as the vas deferens that transport sperm, and glands such as the seminal vesicles and prostate gland that add fluids to the sperm to create semen, therefore nurturing and conveying the sperms to the external environment.
This applies similarly to the female reproductive system, with structures such as the ovaries, Fallopian tubes, and additional glands contributing to gamete production and fertilization. Therefore, the correct answer to the question is D) all of the above.