selection B- females generally have a lengthy gestation period and have a low potential of producing many offspring, so therefore they need to be choosy when selecting the best possible mate. In addition, males secrete billions of sperm per and are cheaply made, conversley, females only produce one egg per cycle and that egg is energetically costly to produce, therefore discretion when choosing mates is the females concern, while males must spread their seed and attempt to procure as many mates as possible.
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