09 April 2014

Biology Notes (all in one)

Here is a pdf file with all Biology Notes for you to download.

The pdf files for separate chapters are also available. 

Good luck! 

07 April 2014

# 155 Summary of Human and Ecosystem

CO2 and methane are greenhouse gases, trapping outgoing long wavelength radiation in the atmosphere and warming the Earth. Increased concentrations of these gases are causing global warming.