Which of the following is a FALSE statement? A. Heat moves through solids by conduction. B. Molecules move faster in warmer substances. C. Warm water is denser than cold water. D. Heat moves through liquids and gases by convection.

' C ' is ALMOST always false.

Except in the case of water, between 0°C and 4°C.

In that little sliver of a range of temperature, the warmer water gets, the denser it gets.  

b. a lightning bug, plug of grass, and a worm

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.