NATO stand for North Atlantic Treaty Organization.
Answer: 180 degrees
The angles of a triangle always sum to 180 degrees.
Answer: The Troposphere
The CO2 levels have risen about 40% since the industrial revolution. As of March 2011, the CO2 level was about 0.04%.
People with O- blood can give blood to anyone. The other blood types can only donate to certain people depending on their blood type. For example, if you are AB+ you can only donate to other AB+ blood types, but you can receive blood from anyone.
An octopus has two eyes and four pairs of arms... it is bilaterally symmetric. It has a beak, with its mouth at the center point of the arms.