Evolutionary biology. What the sperm count costs.
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D000818:Animals; D005075:Biological Evolution; D017173:Caenorhabditis elegans / Q000502:physiology*; D005260:Female; D008017:Life Expectancy; D008297:Male; D012098:Reproduction; D012727:Sex Characteristics; D013094:Spermatozoa / Q000502:physiology*