Group the buttons according to any characteristics you choose. Next, group the peanuts according to external structure and characteristics. Then, break open the shells and consider the internal characteristics. Finally, sort the plant leaves according to structure and characteristics. Try re-grouping them according to alternate characteristics.
Conclusions Consider how much easier it was to group the non-living buttons than the living leaves.
Emphasize that although the peanuts varied in structure, they were all still members of the same family.