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Which of the following suggests Mars may have once supported life?
Fossils have been found on Mars' surface.
Flood plains indicate water may have existed in the past.
Rocks on the planet's surface have high concentrations of iron.
Mars' atmosphere contains carbon dioxide, just like Earth's atmosphere.

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Answer:

Flood Plains indicate water may have existed in the past.

Explanation:

Flood plains have been found on mars and I got this question correct in OW

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The flood plain indicate water may have existed in the past, which suggest that Mars may have once supported life. The correct option is B.

What is flood plain?

A floodplain or floodplains is a flat area of land adjacent to a river or stream. It stretches from the river's banks to the valley's outskirts

The suggestion that reveals that Mars may have once supported life is that flood plains indicate water may have existed in the past.

Thus, the correct option is B.

For more details regarding flood plains, visit:

https://brainly.com/question/13083329

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