Answer:
Melanin helps the mouse survive because of the fur color. Its color helps it to blend into its surroundings, making it a lot harder for predators to kill it, as the predators have a harder time seeing the mouse.
Explanation:
I think it is C as plants take in Co2 and release oxygen which humans use to breathe.
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Channels with a low gradient
Your answer would be $4 times $y.
Hope this helps; have a great day!
The answer should be Groundwater.