A baseline for experimental investigation is provided by an hypothesis. This is a must before conducting experiments. Also, it is the hypothesis that is being proved by doing the experiments. So, hypothesis is very important in research studies. Hope this answers the question.
Your answer is C. Both gasoline and litter would need to be physically separated from the water, because neither bonds with the water.
I think a shovel is a wedge simple machine.
The answer is (3) CH3COOH. CH3COOH is a acid. It can ionized in water. So the solution can conduct an electric current. And the other three can not be ionized in water.
<span>A. Mechanic agitations</span>
