Explanation:
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When prolonged and excessive rainfall the more water percolates and the water table (below the earth surface/soil) rises. The higher the water table the more the possibility increases for a spring to form in the sense that it would now be easier for the water to find a means of escaping the underground through perhaps a crack or a cave, etc.
Yes they did. It is generally known that amphibians breathe through their skin.
The astronomical unit, otherwise known as AU is used to measure long distances in the universe.
In photosynthesis oxygen is released to the atmosphere which means the third option is correct.
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