âº a gradual process of change and development. âº biology Evolution is the process by which the physical characteristics of types of creatures change over time, new types of creatures develop, and others disappear. (Definition of âevolutionâ from the Cambridge Academic Content Dictionary Â© Cambridge University Press)
You can remember the difference between endotherms and ectotherms if you remember that endo- means inside endo- = inside and ecto- means outside ecto- = outside, so endotherms generate their own heat from within, and ectotherms get their heat from the outside.
With a few exceptions all reptiles such as the lizard are cold blooded creatures. The temperature of an animalâs blood (whether an animal is warm blooded or cold blooded) is related to its body temperature. Cold blooded creatures such as the lizard take on the temperature of their surroundings. In other words, they are hot when their environment is hot and cold when their environment is cold. In hot environments, cold blooded animals can have blood that is much warmer than warm blooded animals.