How has selective breeding changed the wolf into the many different breeds of domestic dogs that we know today? a. animals with the traits that were desired were bred to each other. b. as civilization changed, so did our need and desire for different types of dogs. c. the fear of humans was bred out of wild wolves. d. all of the above.

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.