<span>Catalysts increase the rate of reaction without being used up. They do this by lowering the activation energy needed. With a catalyst, more collisions result in a reaction, so the rate of reaction increases. Different reactions need different catalysts.</span>
Answer:
Nitrates
Explanation:
A. Acid-- acid is right, but not the best answer.
B. Nitrates are fertilizers, which are things that would be used in all of these situations
C. Fuel-- no one is pouring gasoline on their grass to make it grow.
D. Sewage-- same as gas, but this time it is sewage.
Proteins are molecules made of amino acids. They are coded for by our genes<span> and form the basis of living tissues. They also play a central role in biological processes. For example, proteins </span>catalyse<span> reactions in our bodies, transport molecules such as </span>oxygen<span>, keep us healthy as part of the </span>immune system<span> and transmit messages from </span>cell<span> to cell.</span>