Read the passage carefully and answer the questions 1 to 5 that follow.
Chameleons can change their skin colour, but not because they choose to. The chameleon changes colour to help it avoid its enemies. It is a form of camouflage, a disguise that allows it to blend in with its surroundings. The change is actually determined by environmental factors such as light and temperature.
Bright sunlight darkens the skin. On cool nights, the colour fades to a creamy colour. The colour changes when the chameleon is excited, angry
or scared. The colour change is rapid and increases when the chameleon is handled, injured, or approached by another chameleon. There are many types of chameleons. Almost half of them are found on the African island of Madagascar. Others occur mostly in the Sahara Desert, with a few in western Asia and southern Europe. Chameleons live in trees, where they usually eat insects. Very large chameleons can even use their sticky tongues to catch birds.
What factors determine a chameleon’s colour change?