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In some reptiles, what environmental factor determines whether the developing animals will be male or female?

Question
In some reptiles, what environmental factor determines whether the developing animals will be male or female?
The amount of sunlight the eggs receive
The temperature at which the fertilised eggs are kept
The pH of the soil around the eggs
The humidity level only
Answer
The temperature at which the fertilised eggs are kept
Detailed Explanation
The chapter states that in some reptiles, the temperature at which fertilised eggs are kept determines whether the offspring will be male or female.
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