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Biology 2108 Lecture
Biodiversity - Introduction

 


   
  Why has it been so hard to categorize the major groups of organisms on Earth?

A recent phylogenetic tree of life on Earth (Click on event or taxon to go to mini-lecture:):




















BACTERIA





and









ARCHAEA




 Origin 




 of life  various







PROTISTAN







Origin of

groups







eukaryotes

bryophytes






PLANTS

pteridophytes









seed plants


















FUNGI





























more PROTISTAN




















parazoa






radiata






   







ANIMALS

platyzoa








lophotrochozoa




















ecdysozoa






















deuterostomes



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