Dear Karol, Thanks for your message, I have converted the slides into a pdf file. This should show in all browsers, avoiding loading problems. Let me know if you have any more problems. Best wishes, David
Modelling energy with pyramid diagrams (2025)Dear Farhana, There are model answers for the guppy evolution questions here, I have just renamed...
Sexual selection examples (2025)Although I have not opened student access to this page (page is locked above), my students can still access it from the link on A3.1 topic test.
Molecular biology test - mark schemeThe overproduction model answers is partly missing
Variation & overproductionI had the same question. I accepted 6 from my students.
C4.2 Transfers of energy - written taskHi David, The link to the self-marking online summary is not accessible. Can the correct link be added? Thanks
Di-Hybrid Crosses HL (2025)Where is the HL content for membranes and transport?
Membrane Structure (2025)Deduce the number of trophic levels in the longest food chain that can be constructed from this food web. The answer says 5 - but we can count 6 no? Example: seaweed (1) - crab (2) - squid (3) - pinguin (4)- leopard seal...
C4.2 Transfers of energy - written taskHello, Can we please have answers for the guppy evolution questions?
Sexual selection examples (2025)
David
Site authorDear Natalie, Thanks for commenting, I have replaced the link on this page. Best wishes, David
B2.3 Cell specialization - topic test