The is most responsible for the weather. Its lowest layer, the , contains most weather phenomena.

its fill in the blank

The correct answer is troposphere.

Explanation:

The atmosphere comprises the four layers, that is, the troposphere, stratosphere, mesosphere, and thermosphere. Of these, the atmosphere is formed majorly of the troposphere, that is, about 75 percent, and is present in the lowest level of the atmosphere. It covers about 16 kilometers of height from the equator and is the prime region where the majority of the weather phenomenon takes place.  

Weather is the term given to the wind and precipitation conditions, and the short-lived temperatures that differ from one place to another. The pattern of weather is primarily predicted in the troposphere, that is, the lowest level of the atmosphere.  

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

its temperature is increasing. this causes molecular vibrations to increase.