Fungi, protists, and algae are among the most diverse life forms on the planet. Tiny protists range from plants to animals. Algae range from single-celled plants to 60-foot-long kelp. Fungi occupy a kingdom of their own. Although their place in nature may make them seem strange, they are actually quite familiar to us for their use in various foods, medicines, and biotechnologies. Indeed, our consumption of bread or reliance on penicillin would not...