In which part of the human respiratory system does actual oxygen exchange take place?
a...
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An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen
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If a dna molecule has 100 nucleotides and 22 of them are cytosine, how many thymines does it have?
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