What would happen if photosynthesis on earth stopped? all plants and animals would die due to the absence of oxygen and carbohydrates (glucose) for respiration. all plants would die as they wouldn't be able to produce carbohydrates, while animals would survive because they don't carry out photosynthesis. all plants and animals would survive as they can carry out respiration, despite the absence of photosynthesis. 

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.