The African continent isn't suffering from the environmental challenge "reforestation", since most of the continent hasn't suffered deforestation.
Answer:
(B) Wind turbines convert potential energy into kinetic energ
Answer: No unethical experiment can ever have a positive effect on society.
Explanation:
D. Hydrogen
Two elements make up the overwhelming majority of the sun's matter, by mass: hydrogen (about 70 percent) and helium (about 28 percent).
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