These structures are called Vestigial structures, they resemble structures from the organism's ancestors, but don't have a real purpose for them now.
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Body water homeostasis is regulated mainly through ingested fluids, which, in turn, depends on thirst. Thirst is a sensation created by the hypothalamus, the thirst center of the human body.
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The animals of the Earth and their environment the history of life on Earth how people and animals interact and live how living organisms interact and function Biology answers many questions, but its main focus is how living organisms interact and function.
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