Internal fertilization is the union of an egg and sperm cell during sexual reproduction inside the female body. Internal fertilization, unlike its counterpart, external fertilization, brings more control to the female with reproduction.[1] For internal fertilization to happen there needs to be a method for the male to introduce the sperm into the female's reproductive tract.
Most taxa that reproduce by internal fertilization are gonochoric.[2]:124–125 In mammals, reptiles, and certain other groups of animals, this is done by copulation, an intromittent organ being introduced into the vagina or cloaca.[3][4] In most birds, the cloacal kiss is used, the two animals pressing their cloacas together while transferring sperm.[5] Salamanders, spiders, some insects and some molluscs undertake internal fertilization by transferring a spermatophore, a bundle of sperm, from the male to the female. Following fertilization, the embryos are laid as eggs in oviparous organisms, or continue to develop inside the reproductive tract of the mother to be born later as live young in viviparous organisms.
https://en.wikipedia.org/wiki/Internal_fertilization
Note. fertilizer and fertilization different terms, different context (homophone).
Homophones are words that sound the same but are different in meaning or spelling. Homographs are spelled the same, but differ in meaning or pronunciation. Homonyms can be either or even both.
https://www.merriam-webster.com/words-at-play/homophones-vs-homographs-vs-homonyms
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