You have two cell culture dishes with keratinocytes. The cells in plate A have been recently seeded in their dish. The cells in plate B have been growing there for many days. You need to release them to subculture them, so you add EDTA (a Ca2+ chelator). Cells in plate A are successfully released, but the cells in plate B remain attached. What is the hypothesis for the behaviour of cells in plate B? How could you verify this visually with equipment?