In which ecosystem are animals mostly active at night?

Sonoran Desert

Explanation:

Nocturnal animals are usually awake and active during the night. Some animals can be both! In the Sonoran Desert, many animals are active at night because it is a good way to avoid the extreme daytime temperatures. In the heat of the day many diurnal animals will rest in the shade of a plant or under a rock.

answer called a epicycle;

answer conditional instability;