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Blood has traveled from the heart to the toes. which describes the next step of the circulation process?
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The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.
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Why are scientists concerned about the depletion of the ozone levels in the stratosphere?
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Dna is a nucleic acid polymer composed of which repeating structural unit? a. nucleotides b. phosph...
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