Which of the following is TRUE about most gases? 1) They expand to completely fill their container.

2) They cannot be compressed.

3) All of their particles are the same size.

4) They have a fixed volume.

5) Their particles are very close together.

Explanation:

I think it is the first option

1) They expand to completely fill their container.   :)

Explanation:

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !