Which headings best complete the chart?

A) X: Habitat Destruction
Y: Pollution

B)X: Long-Term Changes
Y: Short-Term Changes

C)X: Short-Term Changes
Y: Long-Term Changes

D)X: Pollution
Y: Habitat Destruction

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.