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Kliman, Richard 14 April 2016.

The type of produced by an organism define its sex.

Proceedings of the Royal Society B: Biological Sciences.

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This size disparity may be associated with the cost of producing egg cells, which requires more nutrition than producing sperm: larger females are able to produce more eggs.

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In anisogamous species, a third gamete size is either unable to invade or to persist, so two genders are evolutionarily stable• "Queening is a take-charge, female-centered act," says Engle, which puts you in control and with no obligation to return the pleasure.

Royal Botanic Gardens, Kew: Kew Publishing.

Animals have two gamete types: male sperm and female egg cells.

Squirting you stepbro for replying.

"Orchid pollination: from Darwin to the present day".