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A research team wanted to produce a smaller variety of German shepherd dogs. They mated the smallest dogs from different litters for several generations. This is an example of which concept?

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What statement describes what happens to the carbon dioxide waste produced by a developing baby during pregnancy?

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The Theory of Plate Tectonics revolutionized scientific thought because it

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Noah visited a park that had many oak trees. Which best describes the role of an oak tree in its ecosystem?