Task: Question Understanding
Input (English): Question: The items listed below were found in a science classroom. * a heart made of plastic with many of its parts labeled * clay formed to look like Earth and other planets * a giant plastic plant cell with removable cell parts These items are all examples of (1) models (2) experiments (3) variables (4) controls?
Output (English): heart, plastic, parts, labeled, clay, Earth, giant, plastic, plant, cell, examples