Home of real teaching & learning
- Full support for teachers
- Focus on critical thinking
- Engaging classroom activities
- Integrated student eBook
- Assessed tasks / qBank
- Practice exam questions
The InThinking Guarantee: Our sites are written by expert practitioners and not by AI
See our AI policyDisclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.
Don't miss out, find out!
- Free trials Take out a one month free trial today!
- Newsletters Subscribe to our FREE subject site newsletters.
Recommendations
Read what users are saying about the site.Video overview
Site authors
IB Approved Workshops
Environmental systems and societies: A focus on internal assessment
IB DP Category 3
Paris, France, 13 - 15 November 2026
Find out more
Environmental systems and societies (New Syllabus)
IB DP Category 2
Paris, France, 19 - 21 February 2027
Find out more
Virtual Think-Ins
Focus On: IB Teaching – A Practical Guide for Teachers new to the IB
20 November 2026
Find out more
Keys to Success: The IA in DP ESS: Initiating & managing
23 November 2026
Find out more
Focus On: Systems Thinking in the ESS Course
1 December 2026
Find out more
Find all InThinking events at
inthinking.net
Quote of the day
It's not as though we can keep burning coal in our power plants. Coal is a finite resource, too. We must find alternatives, and it's a better idea to find alternatives sooner then wait until we run out of coal."
InThinking
Supporting international schools with high quality PD & interactive online resources
Dynamic
Creative
Personal
Creative
Personal
Selected student pages
See all.jpg)
Most popular
See all
Recommendations
See all"Zoe Badcock and Laura Hamilton, along with the InThinking Team, have put together a wonderful resource for ESS teachers. Their eBook is clear and concise with helpful links and videos. Their activities are aligned with the the DP assessments and get..."
Jared Brandt
Uplift Grand College and Career Prep Institute
"The ESS InThinking site is an excellent resource. Although I’ve taught IB Bio for many years, I started teaching ESS a year ago, and I found that the approach to the IB ESScourse was very different. I found that daunting. The ESS resources provide..."
Tim Gurney
American School of The Hague
Subscriber comments
-
It's very helpful; it looks like simple questions, but they're important. Thank you, Zoe!
Early Year 1 Exam -
Actually Zoe, I just taught this today and it was right initially (I misread the text). Water is inorganic, and is the main inorganic component of organisms. Therefore water needs to be removed so that only (organic) biomass is left behind. Can your...
2.2: Energy and Biomass in Ecosystems -
Yes, they have to ask for extra paper. It even says that in the examiner "subject" report.
Early Year 1 Exam
Timea
Thanks a lot, it makes sense now
Topic 1 Example Assessment