Although water levels drop, does the amount of water on earth remains the same-just in different forms?

The answer to your question is yes the same amount of water is always on the earth when living thing die the water that's they consumed is restored to the earth

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

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