Answer an unit of measurement.
For example: inch, hour, minutes, feet, meters.
The primary and most significant greenhouse gas emitted from human activities is carbon dioxide. Burning of fossil fuels is the major cause of increased carbon dioxide emission.The burning of coal, oil, and natural gas is an important energy source to produce electricity.
Auroras normally occur in the Earth's thermosphere.
Answer:
a biological community of interacting organisms and their physical environment.
Explanation:
