(a) sex gands add their secretions to the fow of spems through vas deferens.
(b)they produce seminal fluid.
the prostate secretes seminal fluid that carries sperm in the ejaculate.
(c) They transports mature sperm to the urethra, the tube that carries urine or sperm to outside of the body, in preparation for ejaculation.

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A) Prostate gland and Seminal vesicle are the two glands
Seminal vesicle provides a liquid called semen that helps in the nutrition of sperms.
Prostate gland provides an alkaline fluid that gives nutrition to the sperm.
b) vas deferens plays an important part in the male reproductive system because it acts as a tube for carrying sperms from epididymis.