Your sentence is almost correct but needs a little fixing to sound more natural. Here's the corrected sentence:
Original: An iguana’s scales change colour when the room gets warm or cool, dark or bright around them.
Corrected: An iguana’s scales change colour when the room gets warm or cool, or when it becomes dark or bright around them.
Explanation:
- We add 'or when it becomes' before 'dark or bright' to make the sentence clearer and easier to understand.
- This makes sure the sentence tells us the colour changes happen both because of temperature changes (warm or cool) and light changes (dark or bright).