Question

review the details below.
chameleons may change colors to express emotional states, such as fear, anger, and surprise.
while chameleons are usually brown or green, they may turn darker or lighter to warm up or cool off.
male chameleons display bright colors to signal that they are ready to mate.
choose the best topic sentence to introduce a paragraph containing these details.
chameleons can show a wide range of colors, from bright to muted.
chameleons are able to change colors due to a specialized process that affects pigments below a transparent layer of skin.
chameleons change color as a response to varying emotional and physical states.

Explanation:

The provided details cover chameleons changing color for emotional states (fear, anger, surprise), physical temperature regulation, and mating readiness (a reproductive/physical signaling need). The correct topic sentence must encompass all these emotional and physical triggers for color change. The first option only describes color range, not the reasons. The second focuses on the biological mechanism, which is not addressed in the details. The third option includes both emotional and physical state responses, matching all the given details.

Answer:

Chameleons change color as a response to varying emotional and physical states.