Summary of the development of vertebrate fish and mammals from the "life on earth" series. 

 - Videocassette (VHS)(113 min.) : sd., col. 1/2 in. 
<br/><br/> Natural history narrated by David Attenborough. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Life--Origin.<br/>Attenborough, David.<br/>Evolution.<br/>Evolution (Biology)