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        | scientist who studies living things, including their origins, structures, activities, and distribution |  | 
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        | a high, steep slope or cliff |  | 
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        | a pond or small lake, especially one connected with a larger body of water |  | 
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        | making a deep, heavy, continuous sound |  | 
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        | of or like the regions 23.45 degrees north or south of the equator where the sun can shine directly overhead |  | 
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        | large water birds with long, slender, curving necks |  | 
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        | any of the five great regions of Earth's surface |  | 
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