Chemistry helps! The most important adaptation is how animals regulate their body temperature. Animals can be either warm-blooded or cold-blooded. Warm-blooded animals, which are mostly birds and ...

If animals get too hot or too cold, they can die! This snake is sunbathing, or rather, basking in the sun. Snakes, like all reptiles, are cold-blooded animals, also called conformers. This means ...

Instead, now, of a single species in a given locality, consider two nearly related steno-thermal species of marine cold-blooded animals, one living in cold seas, the other confined to warmer waters.