Answer: Power plants
Explanation: They release the waste from it into the air
Answer:
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These useless leg bones are vestigial structures. It was believed that the only vertebrates existing were water creatures. Over time, they developed hips and legs as they eventually walked out of the water which later evolved to land creatures. Some of these are mammals, and they later moved back to the water. Biologists believe this to have occurred 50 million years ago.
Answer:
that would be C. pancreas, gall bladder, and salivary glands