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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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Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine
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This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement
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Molecular clocks are models that use mutation rates in dna to measure evolutionary time...
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