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.
External Respiration. External respiration is the process wherein animal life receives air from the environment and in a gaseous exchange returns the air to the environment in another form. This gaseous exchange takes place in all life forms, from insects to fish to human beings to plants, including algae and fungus.