First answer get branlyist As altitude increases, what happens to air pressure?
It fluctates.
It increases.
It decreases.
It stays the same.

It decreases

Explanation:

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.