Practice problem
Respond to the Environment — Characteristics of Life
By Valeri Natole
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By Kupos (Own work) CC BY-SA 3.0 or GFDL, via Wikimedia Commons
Some chameleons actually change colors to respond to environmental temperature. If a chameleon gets cold, it might change to a darker color to absorb more heat. Or if it gets hot, it could change to a lighter color to absorb less heat. Chameleons change their colors in this way to respond to a/an ____________ stimulus.