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Waveform Audio File Format  |  1995-06-29  |  360.6 KB  |  1 channel  |  22,050 sample rate  |  33 seconds  |  [TEXT/LMAN]
Transcription: Evolution is a gradual change in living things that happens over a long time, often millions of years. Evolution happens because organisms compete for food and mates. Although organisms may belong to the same species, they still have differences. Some give an organism a better chance of survival, and so these favorable characteristics can be passed on to its offspring. Other individuals without these characteristics might die before reproducing. This weeding out process is called natural selection.