Answer: the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.
Because uv waves (ultra violet waves) are harmful to you, they could give you skin cancer or shorten your life
Thin atmosphere with low oxygen and carbon dioxide levels
Answer:
b. hibernation to lower metabolism in the winter
Explanation:
Tundra, besides the one I live in apparently, are very, very dry because of the cold. This means that it may be helpful to hibernate for the part of the year where it is even too cold for plants and other animals.
Neural networks, because even the most basic functions require circuits of neurons rather than just a single neuron.
