Rosa is planning an investigation using a microscope to try to identify a group of cells. She sees that the cells are joined together, so she knows that they are from one organism. If she also sees that all of the cells have cells walls, Rosa can conclude that she could be looking at bacterial cells. human cells. mouse cells. plant cells.

either bacterial cells or plant cells but I think bacterial

Explanation:

from google: Bacteria are single celled microbes. Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). ... They can exist as single cells, in pairs, chains or clusters.

- cannot be human or mouse cells as both are animals and animal cells do not have cell walls