Schaeffer, B <br/><br/>
The role of experimentation in the origin of higher levels of organization.  [electronic resource] 

 -  Systematic zoology  Dec 1965 
 - 318-36 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0039-7989 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adaptation, Biological<br/>Animals<br/>Biological Evolution<br/>Paleontology<br/>Vertebrates