Answer:
Chuck said it could not be any living thing because it was not made of cells.
Explanation:
The main characteristic on the basis of which living things are separated from non- living things is the presence of cells in living things. A living thing might be made up of only one cell like prokaryotes or it might be made of multiple cells like eukaryotes. Most likely, a crystal structure won't have any cells or organelles in it. Hence, Chuck can tell that the small square crystal is not a living thing.
