Animals that cannot regulate their body temperature internally and rely on environmental heat sources are known as:

You're on a roll — Here's the answer to your question: Question 14: Animals that cannot regulate their body temperature internally and rely on environmental heat sources are known as: Poikilothermic animals are those whose body temperature varies with the ambient temperature. They cannot maintain a constant internal body temperature and depend on external heat sources. This is also commonly referred to as being "cold-blooded" or ectothermic*. Homothermic animals (also known as homeothermic or "warm-blooded" or endothermic*) maintain a relatively constant internal body temperature, regardless of external temperature fluctuations, through internal metabolic processes. Polythermic is not a standard biological term for temperature regulation. The description perfectly matches the definition of poikilothermic. The final answer is A. Poikilothermic. Last free one today — make it count tomorrow, or type /upgrade for unlimited.