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Updated: May 27, 2025
They are only 1/250 of an inch in diameter, and thus are only half the size of the mammal ova, and have no distinctive features. Fecundation takes place when these lively ciliated cells of the sperm approach the ovum, and seek to penetrate into the yelk-matter or the cellular substance of the ovum with their head-part the thicker part of the cell that encloses the nucleus.
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