The answer is D.
The highest amount of immigrants to the US in 1965 consist of Mexicans, basing in Latin America.
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C. ice caps and glaciers
The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.
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