Answer:
C. Moving a bone back and forth requires the action of at least two muscles.
Explanation:
To move bones in opposite directions muscles must pair up to help move the body part.
each cell carrys cytoplasm, where chemical reactions occur in the cell.
the heat is used to break the bonds between the ice molecules as they turn into a liquid phase. Since the average kinetic energy of the molecules does not change at the moment of melting, the temperature of the molecules does not change.
