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the answer would be c 20k hz
Ecology is the study of interactions between the environment and living creatures.
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Trail of Tears, in U.S. history, the forced relocation during the 1830s of Eastern Woodlands Indians of the Southeast region of the United States (including Cherokee, Creek, Chickasaw, Choctaw, and Seminole, among other nations) to Indian Territory west of the Mississippi River.
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