Assertion: chordate's development | /r/CapableOf | hasten by endothermy
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Source sentences:
text: As compared to other viviparous vertebrates, mammals are born small (the average litter is about 10% of mother’s weight), reducing the burden upon their swift mothers, but they deem to become independent of their parents very quickly, perhaps due to the development prolonged by lactation and hastened by endothermy.