Question

review the details below.

• male chameleons display bright colors to signal that they are ready to mate.
• 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.

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 details cover color changes for mating (physical/behavioral), emotional states (fear, anger), and thermoregulation (physical need to warm/cool). This topic sentence encapsulates all these response-based reasons for color change, whereas the others focus only on color range or the mechanism of color change, which are not the main focus of the details.

Answer:

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