Dry ice pellets, the solid form of carbon dioxide, were placed in the bottom of this flask. The flask was then covered with a balloon. Within 15 minutes, there was a change in the flask, as seen here. Explain what happened to the CO2 molecules. Which image BEST provides a visual explanation?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?