The correct answer is:
A. A group of related parts that work together to achieve a desired result.
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Answer:
A bat using echolocation.
A whale using sonar waves.
A gazelle listening to the footsteps of a cheetah and running away.
Explanation:
My extensive knowledge of the show Wild Kratts.
Red bone marrow. Oxygen and carbon dioxide bind to different parts of the hemoglobin
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I think the answer is Time