I made the cells with FIMO clay and hand sanitizer with red food coloring to create the liquid. The oxygen cells were not placed inside the jar. It was made to explain how the red cells carry oxygen.
The only problem with the work was that after a few days, the hand sanitizer becames liquid and the cells go down to the bottom of the jar. I haven't tried hair gel, but it may work better instead of the hand sanitizer.
My students loved it!!!
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