They are made of some of the same matter
First, he should measure how long it takes for the liquid to become clear if X and Y are mixed together. Then, he should measure how long it takes if he also adds substance A to X and Y. He will find out if substance A is a catalyst. hope this helps :)
A. yellow
The yellow xanthophylls are the next most soluble, followed by the blue-green chlorophyll A. The least soluble pigment is the yellow green chlorophyll B. You may be wondering why plants have more than one pigment.
<span>If high amounts of sulfanilamide are in the presence of an enzyme whose substrate is paba, then the enzyme would stop functioning since the sulfanilamide inhibits the action of the enzyme. Hope this answers the question. Have a nice day.</span>