MY REFERENCES

BOOKS

•  Biggs, Hagins, Kapicka, Lundgren, Rillero, Tallman, Zike, 2005  year(published), Biology:The dynamics of life, Mc Graw. Hill companies. 
• Schraer, Stoltze, 1991 year(published), Biology:The study of life, Needham Massachusetts   Englewood cliffs, New Jersey.

WEB SITES: Search Engines

www.google.com(advanced search)

www.altavista.com

www.dogpile.com(just for pictures)