The photo shows insect mounds (nests) in hot northern Australia - HSC - SSCE Biology - Question 17 - 2013 - Paper 1

The structure of the insect mounds is designed to optimize temperature regulation. By having a narrow side facing the midday sun, these nests minimize direct sun exposure during the hottest part of the day, while their wide sides allow for more heat retention during cooler times. This design enables the insects to maintain a stable internal body temperature, despite the fluctuations in external temperatures throughout the day.