Final answer:
The color change in a chameleon corresponds to a physical change, not a chemical change, as it involves the rearrangement of crystal structures within the chameleon's skin cells without altering the molecular composition of the pigments.
Step-by-step explanation:
The change in color of a chameleon is considered to be a physical change, not a chemical change. This is because the chameleon's color change happens as a result of a rearrangement of crystal structures in their skin's cells, specifically in particular cells known as chromatophores. The pigment molecules remain the same during this process, only their arrangement changes. Therefore, no new substances are formed which is a requirement for a chemical change. This rearrangement allows chameleons to change color to adapt to their environments.
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