Evolution by natural selection :  [and] Species and population / 
prepared by the Science Foundation Course Team, the Open University. 
 - Bletchley, Bucks. :  Open University Press,  1971. 
 - Science Foundation Course Unit ;  19-20 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biotic communities.<br/>Ecology.<br/>Evolution.<br/>Natural selection.