3. IV:height of drop DV:height of bounce CV: type of ball, place where ball is dropped, climate/wind
4. IV: battery type DV: time that it lasts CV: age of batteries, age of material (flashlights), type of materials (flashlights), size of batteries
5. IV:depth of water DV: temperature CV: amount of water in lake, temperature, climate/season
They are thus known as the "supporting cells" of the nervous system. The four main functions of glial cells are: to surround neurons and hold them in place, to supply nutrients and oxygen to neurons, to insulate one neuron from another, and to destroy and remove the carcasses of dead neurons (clean up).
Water, air, food. and heat.
<span>The correct answer to this question is a line graph. If Rob needs to create a graph that is able to display the combination of two different values - in this case, level to which the salt has dissolved and time taken - and he needs to have more than one result included, then a line graph is the way to present this.</span>
