1.) Enzymes are a type of protein that speeds up the rate of chemical reactions
2.) Catalase is an enzyme in the liver that hydrogen peroxide (H2O2)
3.) By lowering the activation energy needed
4.) Catalysts
<span>the passing of fatal diseases from one organism to another hope this helps</span>
I would say D because it involves more selection but if that one is wrong it is most likely B. But I would go with D
They have every thing you need on http://www.factmonster.com/ipka/A0932480.html
The amount of gravity on mars. How much power is needed to slow it down enough for it to land safely. Also what angle to put it into mars orbit so it lands where the engineers know where it is going to land.
