She sees that the cells are joined together, so she knows that they are from one organism. She also sees that all of them have cell walls. what could Rosa could be looking at:

animal tissue/ flesh

Explanation:

multi cell like us we have all that in our flesh so if we looked at it under the scope it would look that way

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it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.