An advantage of internal fertilization over external fertilization is that A. Internal fertilization allows animals to reproduce sexually.
B. Internal fertilization requires much less expenditure of resources.
C. Internal fertilization produces more offspring, ensuring rapid population growth.
D. Internal fertilization prevents the drying out of gametes in a dry environment.

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.