Semen
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Semen, also known as seminal fluid, is a bodily fluid that contains spermatozoa from the male gonads of animals. In humans and placental mammals, seminal fluid is ejaculated through the penis via the
Spermatozoa, in this case human, are a primary component of normal semen, and the agents of fertilization of female ova.
Human semen in a Petri dish
Semen stain on carpet observed with and without ultraviolet light
Reproductive system
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The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction and asexual reproduction. Many n
A newborn joey suckles from a teat found within its mother's pouch
A male common frog in nuptial colors waiting for more females to come in a mass of spawn
Animal castration a book for the use of students and practitioners
The comparative anatomy of the domesticated animals