Genetics Textbook website http://highered.mcgraw-hill.com/classware/infoCenter.do?isbn=0072995394
Ecology Textbook Website http://www.aw-bc.com/withgott
E Nature Field Guides http://www.enature.com/fieldguides/intermediate.asp?curGroupID=10
Common Trees of Pennsylvania http://www.dcnr.state.pa.us/forestry/commontr/index.aspx
World Wild Life Fund - Endangered Species http://www.worldwildlife.org/endangered/
US Fish & Wildlife Service Endangered Species Program http://www.fws.gov/endangered/
Animal Fact Sheets http://www.kidsplanet.org/factsheets/map.html
Endangered Species Profiles http://www.endangeredspecie.com/specieprofile.htm
IUCN Red List of Endangered Species http://www.iucnredlist.org/
DNA/RNA http://www.biologycorner.com/bio4/notes/gene-expression.php
Genetics Article - Chromosome Tips http://www.mhhe.com/biosci/genbio/life/articles/article19.mhtml