Which of the following is the best definition of the term nonrenewable resource?
A. A resource that can be replaced naturally within a reasonable time
period
B. An inexpensive resource
C. An expensive resource
D. A resource that takes many years to replace

Which one A or D help me pls

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.