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.
Cold-blooded animals have a variable body temperature which reflects the environmental temperature (eg. fish and reptiles). Warm-blooded animals keep their core body temperaâ¦ture at a nearly consistent level regardless of the temperature of the surrounding environment (eg. birds and mammals).