EE in Biology 

All relevant information can be found here. 

https://ibpublishing.ibo.org/extendedessay/apps/dpapp/guidance.html?doc=d_0_eeyyy_gui_1602_1_e&part=5&chapter=2&section=1

EE in World Studies

All relevant information can be found here

https://ibpublishing.ibo.org/extendedessay/apps/dpapp/guidance.html?doc=d_0_eeyyy_gui_1602_1_e&part=8&chapter=4

Other useful information that can be found here 

https://www.biologyforlife.com/extended-essay.html