A fungus is a group of organisms that produces spores and eats up organic material, like the yeasts in bread or beer, the mushrooms in your salad, the mold that may grow if you let that salad sit in the refrigerator for too long or even the organisms that produce antibiotics like penicillin.

The biologist looked at a spore under the microscope.

Fungi disperse spores.

Be careful not to inhale the spores; they're deadly.