Ecosystems  [videorecording] / 
 Understanding science. 
TMW Media Group. 
 - Venice, Calif. :  TMW Media Group,  2003. 
 - 1 videodisc (22 min.) :  sd., col. ;  4 3/4 in. 
 - Understanding science, v. 4 .
 - Understanding science (Venice, Calif.), v. 04. .
<br/><br/>With Dr. Science. 
<br/><br/> Dr. Science describes the ways plants and animals disperse, compares the six major land biomes, and explains the factors affecting cycles and rhythms of living things. 
<br/><br/><label>ISBN: </label>0709629002043 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biotic communities--Juvenile films.<br/>Ecology--Juvenile films.