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Hormone-Mediated Modification of Intercourse Ratio in Vertebrates The capacity to adjust intercourse ratios during the specific level exists among all vertebrate teams learned up to now. Quite often, there clearly was proof for facultative modification of intercourse ratios in reaction to environmental and/or cues that are social. A role in the adjustment of sex ratio in vertebrates, because the endocrine system acts as a prime communicator that directs physiological activities