Question

What’s an example of an organism that can’t reach homeostasis through internal changes

Circulation decreases in a bird when it becomes too warm
Person gets a fever in response to flu infection

Answer 1

An example of an organism that can't reach homeostasis through internal changes would be a poikilothermic (cold-blooded) animal, such as a reptile. Reptiles rely on external environmental conditions to regulate their body temperature because they lack the ability to internally maintain a constant temperature.

For instance, when a reptile such as a lizard becomes too warm, it may not be able to reduce its internal temperature through internal physiological means like sweating or altering circulation as warm-blooded animals (endotherms) do. Instead, it must seek shade or burrow into the ground to cool down. This reliance on external factors to maintain homeostasis highlights the limitations of their internal regulatory mechanisms.