Why dogs and cats show oestrus cycle but human being have menstrual though both are are mammals?
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oestrus cycle occurs in non primates like he, dogs, cats etc...while primates have menstrual cycle...like apws , chimps , humans etc
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Menstrual cycle is not the characteristics of mammals. Dogs and cats are non primates thats why they have oestrus cycle and human are primates so they have menstrual cycle.
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