The correct answer is C.) - the Isthmus of Panama. Isthmus is a narrow strip of land and the Isthmus of Panama was the optimal place for a channel between the two oceans.
Answer:The moon's gravity is about 1/4 as strong as the earth's gravity. Our muscles a built to carry us on the earth. The astronauts are used to walking on earth so when they push forward with their legs they tend to use the same amount of energy which is 4 times more than needed.
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Answer:
I believe the correct answer is D)
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