Evidence for evolution lesson for AQA GCSE Biology: how fossils form, the fossil record, resistant bacteria data, worksheets and full answers.

This is a complete lesson on the evidence for evolution for AQA GCSE Biology (8461), covering specification points 4.6.3.4 (evidence for evolution), 4.6.3.5 (fossils) and 4.6.3.7 (resistant bacteria). It is Lesson 19 of 20 in Topic 6: Inheritance, variation and evolution, and is designed to last 60 minutes.

Students learn the definition of a fossil and the three ways fossils form: from parts that did not decay, from parts replaced by minerals, and as preserved traces such as footprints, burrows and rootlet traces. They interpret rock layers to see how fossils show change over time, explain why early soft-bodied life and geological activity mean scientists cannot be certain how life began, and see antibiotic resistance in bacteria as evolution happening fast enough to observe. The resistant bacteria section is a short recap that builds on the earlier lesson on antibiotic resistance, then applies it to new data.

The previous lesson covers theories of evolution, and the next lesson covers extinction.

Includes:

• PowerPoint lesson (33 slides) with full teacher notes on every slide: timings, answers, misconceptions and questioning prompts.
• Editable Word worksheets: a fossil formation card sort, a rock layers data sheet, an antibiotic resistance data sheet, and exam-style questions (core and support versions).
• Word lesson plan with objectives, lesson sequence, differentiation, answers, sensitive-topic guidance and common misconceptions.

Every activity offers support and stretch that all students can choose, so no one is singled out. Support includes clue words, a word bank, sentence starters and a hinted version of the exam-style questions. Stretch tasks ask students why jellyfish fossils are rare, what a rabbit fossil in very old rock would mean for evolution, and how penicillin resistance could be reported before the drug was widely used.

The slides follow the British Dyslexia Association Style Guide: a clear sans serif font at a large size, a soft cream background, bold (not italics) for emphasis, left-aligned text and plain English. Levels of challenge never rely on colour alone, every slide has a proper title for screen readers, and diagrams include alt text.

Teacher notes include guidance on teaching evolution respectfully when students hold different beliefs.

How you could use it:

• Teach it as the lesson after theories of evolution, before extinction.
• Use it as a ready-made cover lesson: the teacher notes explain every step.
• Add the optional plaster of Paris fossil model suggested in the teacher notes.
• Use the exam-style questions and data sheets for homework, retrieval practice or revision before mocks.