You didn't provide the reaction, but enzymes usually just help the reaction take place, often faster then it would in regular conditions. They are completely used up during the reaction and don't affect it in any other way, meaning they don't change the properties of the compounds.
Fossils can only be formed when mud, silt or tar is in the area to preserve the fossil, If erosion does not occur and allows the fossil to form, and Oxygen and microorganisms cannot decay the bones.
<span>A. If one essential nutrient within an ecosystem runs out, primary productivity will be limited.
A specific nutrient is need for every organism in the ecosystem. If this particular nutrient is diminished within the ecosystem then cellular processes will decreases and a great number of specie will die. </span>
Mitosis is a process that makes DNA synthesis
