Spectators often marvel at shows that feature animals doing amazing stunts and complicated maneuvers. Animal trainers use to accomplish this, by reinforcing behaviors that are progressively closer to the target behavior until the target behavior is achieved.

the supreme court plays a big role in government. the constitution gives them ability to check the president and the congresses actions and dictate if their actions are allowed by the constitution or not.

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mammals. mammals of the piedmont region live in several habitats such as wetlands, fields and forests. raccoons live across the state including the piedmont. they've adapted to environmental changes, including the loss of natural habitat.

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answer; criterion validity