Evolution 1

Gap-fill exercise

   advantageous      decay      DNA      evolution      extinct      fossils      selection      variation   
The remains of organisms which lived many years ago are called . They are most often formed from parts of organisms that do not . Most of the evidence for comes from a study of the way in which organisms have changed over long periods of time.
The theory of evolution by natural states that all members of a species show . Some variations are and enable the organism to survive changing conditions, wheras other organisms become .
The newest evidence to support evolution comes from a study of .