How can you explain the leaf fall of plants and hibernation of animals occurring in the middle of summer in hot dry regions of the planet?

The main reason for such leaf fall and such hibernation is lack of water. If there was enough water, then both plants and animals would easily tolerate the temperatures that are characteristic of these regions. Having lost their leaves, the plants stop photosynthesis, but they remain alive and do not dry out. The same system in animals: in hibernation, they survive the heat and retain water.

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