Definition: Anisogametes, also known as spermatozoa, are tiny, motile cells that fertilize a gamete during sexual reproduction in most forms of multicellular organisms such as humans, worms, insects, and plants. They function like sperm do in human reproduction, but with the addition of a unique structure called a nucleolar ring. Spermatozoa are crucial for many reproductive processes, including fertilization by other species (eg, in mammals), sexual transmission from one parent to offspring, and embryonic development within multicellular organisms.
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