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Biology, 23.04.2020 05:20 misaki2002

Which of the following statements is true?

1. The total amount of water in an ecosystem is always increasing.
2.Thermal pollution is the main disadvantage of hydroelectric power.
3.Wood and water are nonrenewable natural resources.
4. The greenhouse effect is primarily caused by cars and trucks.

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Which of the following statements is true?

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