What is the coldest layer of the atmosphere

As the mesosphere extends upward above the stratosphere, temperatures decrease. The coldest parts of our atmosphere are located in this layer and can reach –90°C. In the forth layer from Earth's surface, the thermosphere, the air is thin, meaning that there are far fewer air molecules.

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )

Answerscripps institution of oceanography; i believe this is correct plz check first good luck;