Expert: Walter Hintz - 6/3/2007

Question
QUESTION: hi
i have 2 questions
Describe the symbiosis theory of development.
and
describe the defference between cnidarians and annelids
thanks!
bye

ANSWER: Hi ellla
 I assume the first question refers to biosymbiosis to explain speciation.  There is a whole book on this topic. For the answer here I would like to refer you to Lynn Margalis (google her)

 Cnidarians are very different from annelids.  They are all aquatic, are unsegmented and had a radial symmetry.  They capture food with stinging cells and have a two stage metamorphosis.  Annelids have a semi closed circulatory system and internal fertilization.

---------- FOLLOW-UP ----------

QUESTION: thanks,
i typed it wronge but my first question is
describe the symbiosis theory of eukaryotic development

Answer
Hi again ellla:
My answer is the same.  This idea has to do with development of eukaryotic species.  Basically the idea is that species living together (symbiotic) bring about a new species.  It is best for you to read some complete papers on this.  Google symbiogenesis