Science

During the seventeen hundreds, what creature was thought to excrete blood through its skin?

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Which of these is a unit of length used in marine navigation?
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Which aeronautical term is a moveable surface on an aircraft which controls its motion?
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What is the theory of the beginning of the universe called?
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What type of circulatory system pumps blood into cavities instead of through vessels?
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A very fast white water cascade is also known as what?
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