Can i get short answers to each of these questions?

  1. Clearly explain the differences between external and internal respiration in your own words.
  1. The lungs are mostly passageways and elastic tissue. What are the roles of these two components?
  1. Describe three physical and two chemical factors that can modify respiratory rate and depth and compare their relative importance.

1. When you have a bad head cold, you breathe through your mouth. What possible problems can this cause?

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