Here is a list of revision guides for IGCSE Biology (also guides for Chemistry and Physics):
IB subject website for the new ESS guide
Here is the wikibook for ESS
Free comprehensive IB revision materials for ESS from i-study.co.uk and here are some ESS materials from Ms Iqbal at Uplift North Hills. Resources can also be found at Mr Green’s weebly and online resources (especially worksheets) from Pearson.
Some ESS definitions from Quizlet.
The Sciencebitz Environmental Systems website is designed to help students who are studying ESS (old guide).
What is the subject of Environmental Systems & Societies? – a description from the IB.
From the IB, here is the latest guide:
and here are some FAQs apparently:
Timeline of Human Evolution – from 530 mya – interesting but not useful for the exam (3m 28s):
Here’s another power-point (a bit more detailed than above):
Paul Andersen (from Bozeman High) shows you how to Solve Hardy-Weinberg Problems.
In Crash Course Biology #18 – Population Genetics: When Darwin met Mendel, Hank talks about population genetics including the Hardy-Weinberg equation.
The Hardy-Weinberg Principle: Watch your Ps and Qs – a video lesson with some practice questions.