When two air masses meet, what happens?

"When two large air masses meet, the boundary that separates them is called a front."

Explanation:

When 2 masses of air meet, they don't mix. The warm air rises and the cool air lowers. This creates a front.

Explanation:

I like weather.

the correct answer is c   with the systems

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.