<span>substances consisting of ions held together by electrostatic attraction
</span>
1. all living things are composed of cells
2. cells are the basic building blocks of life
3. All cells are created by preexisting cells
This movement is known as convection or convection currents. This occurs due to the fact that warmer fluid is of lower density than colder fluid. This causes warmer fluid to rise and colder fluid to sink. This creates circulatory currents within the body of the fluid.
Everything requires energy to move. If the desk is moving, then it has energy.
