A mixture of liquid particles suspended in the air and leave drops behind. gas
aerosol
vapor

answer: my answer would be a) scheduling workouts with your friend for consistent days and time

explanation: for me personally i would be much more likely to go to the gym with a friend because i wouldn't want to cancel on them or stand them up.

answer; /// i believe that the correct answer is (c); ///when the lungs expand, they fill with air from the atmosphere;