One branch to have more power than the rest.
Answer: 78% carbon, 21% oxygen, 1% other
Explanation:
In the absence of an atmosphere, Earth’s surface temperature would be about –18°C, or 0°F, which is way too cold for life. Greenhouse gases have just the right molecular structure to absorb infrared radiation that the Earth emits. It re-emits most of that infrared energy in all directions, warming the atmosphere to its comfortable average temperature of 15°C (60°F). So the greenhouse effect is a good thing.
Answer:Drought, flood, and temperature changes could certainly push people to move on. Climate change also affects the food supply, and anthropologists have assumed that people came to the Americas because they were following food on the hoof.
Explanation:
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