models experiments variables controls
I gave my students this multiple choice 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

Only one answer is correct among these 4 choices:
- models
- experiments
- variables
- controls

Could you tell me which one is correct?

models