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In all species semen carries sperm into the reproductive tract of the female to facilitate fertilizations.
In some species the fertilization may take place externally. In external fertilization, the sperm fertilize the ova directly, outside of the female's sexual organs. Several fish achieve fertilization this way.
The internal fertilization is more common among mammals like humans. In this the fertilization occurs inside the female's sexual organs. The male needs to ejaculate and deposit the semen within the female reproductive tract through copulation. The sperms swim into the tract towards the waiting ova and fertilize it.
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Hey !!
Here's your answer !!
Constituents of semen are:
Spermatozoa
Fluid from seminal vesicles-mainly in the form of fructose.
Fluid from prostate glands which includes acid phosphatases and Proteolytic enzymes
Mucoproteins from bulbourethral gland.
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