English: This diagram show how one set of things in the universe, a set formed by conspecific mammals, can be further divided into those who are at least potentially able to produce ova, those among them that actually do produce ova, those that originally were at least potentially capable of producing ova or sperm but who have been neutered, etc. There is an overlap of the two main sub-sets because a small number of individuals can produce both sperm and ova.
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