As a gas or liquid decreases in heat (gets cooler), what direction will it naturally move?

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.