Directions 1. Describe the unit posttest. Explain the purpose of the unit posttest to students: It will help you as a teacher understand how students think about what happens when decomposers move, grow, an function. It will help them think about what they learned and how their ideas changed over time. 2. Have students take the unit posttest. Distribute copies of 6.5 Decomposers Unit Posttest to be completed with paper and pencil.