Which of the following statements is true?
A. If an object has mass, it's gravity is zero.
B. If an object has mass, it has gravity.
C. If an object has mass, it's weight is zero.
D. If an object has mass, it's weight is less than zero.​

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

What causes the formation of ocean currents?

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?