Hydrogen would be the answer to this.
Answer:
Thermosphere.
Explanation:
The Northern lights are located at the Thermosphere of the atmosphere. The Thermosphere is lies beyond 80 km above the mesopause. The properties of gases are not constant in this layer. temperature increase rapidly with the increase of height. There are number of ionic layers in this sphere. The layer called D disappears with the sunset as it associated with solar radiation.
The answer is A. flattened maxilla.
<span>c. regular exercise has little impact on maintaining peak performance after age 30</span>
