Differentiation Use strategic grouping to distribute strong speakers. Have students explain aloud the investigation plan (to a partner, small group, or whole class) after reading it. Prompt students to consider how this investigation is similar to the investigations in previously taught Carbon TIME units, so they can draw on those experiences when conducting this investigation. Compare class data orally and on the spreadsheet or poster. Modifications Extending the Learning Follow the same procedures to investigate other types of decomposition, such as food scraps, grass clippings, leaves, or wood.