What is the origin of cold, wet air masses? A. Over water in tropical zones
B. Over land in polar regions
C. Over land in tropical areas
D. Over water in polar regions

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus