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1. Why did geologists initially hypothesize that there might have been water on Mars?

2. What did the images sent back by the NASA orbiters and the exploration rovers in 2003 reveal?

3. Critical Thinking Explain why the existence of hematite may not be the best indicator of water on Mars.

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Water and Solutions

Compare the body of a jellyfish with your own body. A jellyfish would die if it was removed from its watery environment. Yet you can live on the driest parts of Earth. Jellyfish and humans seem unlike each other, yet the bodies of both are made of cells that consist mostly of water. The chemical reactions of all living things take place in the aqueous environment of the cell. Water has several unique properties that make it one of the most important compounds found in living things.

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