As water is heated, the motion of the water molecules will generally

1) decrease
2) increase
3) remain the same

Increase

When water is heated the molecules vibrate faster which causes the space between the atoms to increase.  The motion and space between the molecules determine the state of matter (solid, liquid, or gas).

Hope that helps.

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.