Help with number 4 plz

Carbon dioxide because it consists of one type of molecule.

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

The best answer would be the first option a).

1) true2)dispersive media waves of high frequency refract more than do waves of low frequency3) because the eclipses of jupiter's were not regular enough 4) 6m inverted (-6m)