Saprophytic enzyme: bacteria and fungi decompose animal and plant remains into carbon dioxide, water and inorganic salts, which return to the natural environment and are used by plants. Bacteria and fungi promote the material circulation in nature.

Parasitic: Some kinds of bacteria and fungi live parasitically. They absorb nutrients from living animals, plants and human bodies, leading to diseases of animals, plants and people. For example, fungi parasitize the human body, which makes people suffer from tinea pedis.

* * * Health: refers to bacteria and fungi living together with other organisms for mutual benefit. For example, there are bacteria in the gastrointestinal tract of cattle that help decompose cellulose in forage, and cattle provide places and food for bacteria to live, and they depend on each other to live together, so the relationship between bacteria and cattle is * * * health.

So the answer is: √.