Answer:
I don't know this answer at all
Explanation:
I don't know about these problems
Answer: Your nose inhales O2 and goes through these little nose hairs to keep stuff that doesn't belong in your airway, it goes through your nose into your lungs taking in O2 for your blood. The other substances that you have inhaled get absorbed elsewhere and it is converted into CO2 which is what you exhale.
Explanation:
Answer:
B, A, A, B
Explanation:
Just trust me on this one.
It would be "Researchers found environmental safe replacements for CFC's"