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Red Tattoo

This activity explores an image of tattoo ink particles inside cells, which serves as a phenomenon for learning about the structure and color of human skin.

Root Movement

This activity explores images of plant cells and structures, which serve as phenomena for learning about how plants respond to stimuli.

How Do Fibers Form?

In this activity, students construct models of sickle cell hemoglobin fibers inside red blood cells to illustrate how changes in the structure of a protein can affect cell shape, as described in the short film The Making of the Fittest: Natural Selection in Humans.