This document provides a review sheet for a unit test on simple living things, including bacteria, viruses, protists, and fungi. It lists key terms and concepts from chapters 19-21 of the textbook. Students are expected to understand bacterial and viral structure and life cycles, how they are classified, their modes of nutrition, and their importance. They should also know the characteristics of protists and fungi, including their locomotion, reproduction, symbiotic relationships, and roles in ecology. The review sheet acts as a study guide to help students prepare for the unit test.