The air in a scuba tank is composed of approximately 78% nitrogen, 21% oxygen, with the remainder being a mix of argon, carbon dioxide, neon, helium and others.

the answer is c.) there is a warm front in region a and a stationary front in region b.

the main thing i would use is bricks because if there is a hurricane, there is a great possibility for the house to still stand. and i would also use plexiglass windows instead of regular windows because plexiglass isn't prone to breaking.