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sineoko [7]
3 years ago
15

Which of the following statements is true? Natural energy sources are nonrenewable and being depleted. Current fuels are not pol

luting the air. Mercury released into aquatic ecosystems comes from rock erosion. The natural cycles of Earth can clear up our current air and water pollution problems.
Biology
2 answers:
Dennis_Churaev [7]3 years ago
6 0
The first sentence is correct....
VikaD [51]3 years ago
6 0

Answer: Natural energy sources are non renewable and being depleted.

Explanation:

The natural energy sources like coal, petroleum, and natural gas are non renewable sources of energy which means they cannot be replenished after once used. As their demand is increasing their concentration in the environment decreasing.

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The calcium is present in our extracellular fluids, bones, and teeth. The major constituent of calcium is present in the bone. The bone consists of around 90% body;s calcium.

Thus, the correct answer is option (b).

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