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Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating
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When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it
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Which description provides the best objective summary of the article in the passage?
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Vasomotion because of changes in ph or co2 levels would be a result of...
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