Answer:
I would believe the mesosphere would be the most difficult layer to breathe. Troposphere is where we are, ov we can breathe here, stratosphere would be hard to breath in as well
The first one, cause their trying to make it a positive way to reinforce. Which just means their trying to fix something again
Answer:
I think option B is right answer
Answer:
b. developing a hypothesis
Answer:
Nose, Trachea, Bronchi, Lungs (for inhalation)
Explanation:
Just reverse the answer for order of exhalation
