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Explain why worms have outer skin as their respiratory surface rather then lungs. NO google answer. ASAP
Answers: 3
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6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.
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Explain why worms have outer skin as their respiratory surface rather then lungs. NO google answer....
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