It makes sense. The environment has always played (plays and will always play) a crucial role in Natural Selection and I wouldn't be surprised if these ancient plants and animals could only lower their metabolic rate just enough to endure long periods of cold or darkness; obviously, these would survive and produce descendants capable of facing the same conditions as their parents. In evolutionary time, these features would improve and voilà, now we have hibernating bears and dormant seeds, for example :)
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