Why is there less air pressure at higher altitude? A: Air at higher altitudes doesn't have as much air weighing down on it from above.

B: Air at higher altitudes is cooler and less turbulent.

C: The warmer, lighter air rises bringing cooler heaver air to low altitudes.

D: The molecules in the air lose mass and are less effected by gravity, significantly lowering their weight.

Astudent sees several ants walking up a wall following the exact same trail that an ant took earlier. she wants to apply the scientific method to determine how the ants detected the trail. which of these steps would come first in her application of the scientific method? perform an experiment by cleaning the scent away from part of the trail. draw a conclusion that the ants follow a scent trail. make a prediction about what the ants will do after she cleans away part of the trail. hypothesize that the ants are following a scent trail that the first ant left.