Which of the following is not one of earth's four spheres?
hydrosphere
biosphere
atmosphere
mesosphere

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )