What is the function of a carbohydrate in your body ?

All of the following are part of the biosphere except

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

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?