
If you want to know more information you can go to this peges:
http://www.quia.com/jg/3098http
http://www.quia.com/rr/350728.html
http://www.usoe.k12.ut.us/curr/science/sciber00/7th/classify/living/2.htm
http://homes.jcu.edu.au/~zljes/bz1002/lecture8.htm
http://www.ms-starship.com/schttpp
http://www.cals.ncsu.edu/course/ent591k/symbiosis.html
Bibliography
I found thye information in the internet. Mostly I found it in google. the other parts i get out from my notebook of my science class



