Correct Answer: Their body temperature changes in accordance with the atmosphere

Solution : The correct option is their body temperature changes in accordance with the atmosphere.

Ectotherms, or cold-blooded animals, are organisms whose internal body temperature varies with the temperature of their surroundings. Their metabolism is heavily reliant on outside heat sources. Cold-blooded creatures have different ways for controlling their body temperature, but unlike warm-blooded animals (endotherms), they usually lack internal systems for maintaining a steady temperature regardless of their surroundings.