Which sentence best explains how enzymes speed up a chemical reaction?

enzymes are not changed as a result of a chemical reaction.

enzymes add heat to a chemical reaction.

enzymes remove heat from a chemical reaction.

enzymes lower the activation energy of a chemical reaction.

the answer is:

carbon dioxide

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a