Which best describes the relationship between humidity and air pressure?

humid air has higher pressure because of the heaviness of water.

humid air is lighter, so it has lower pressure.

air pressure is lower below sea level because of the humidity.

humidity and air pressure are not related.

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

The sun's gravitational pull is weaker on the planets that are closer to it, i think.