Answer:
They contain two or more substances mixed together.
Explanation: That's all I know about it. I know the other answer is way better but I hope this helps
What is the definition of a Macronutrient?
How do air masses flow?
from regions of low pressure to high pressure
it depends on the time of the day
from regions of high pressure to low pressure
whichever way the wind blows
How do air masses flow?
from regions of high pressure to low pressure
.
In general, cold air masses tend to flow toward the equator and warm air masses tend to flow toward the poles.