An interaction of systems allows for the body to warm itself when it is cold. Which processes help the body warm up when it is cold? Select three options.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point