Environmental Change & Evolution

Curriculum Details

• Subject: Science
• Year Group: Year 8
• Unit: Evolution: Ancestry Unveiled (Lesson 14 of 20)
• UK National Curriculum Reference: Key Stage 3 – Biology: Inheritance, variation, and evolution
• Learning Focus: Understanding how environmental changes influence natural selection and species adaptation

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Lesson Objectives

By the end of the lesson, students will be able to:

1. Explain how environmental changes affect species over time.
2. Describe examples of evolutionary adaptations resulting from environmental pressures.
3. Analyse scenarios where species must adapt, migrate, or face extinction.

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Lesson Structure (45 Minutes)

1. Starter Activity (10 Minutes) – "Survival Roulette"

• Objective: Engage students with real-world thinking about survival and change.
• Display four mystery images on the board: a woolly mammoth, a modern elephant, a dodo, and a peregrine falcon.
• Ask students: "What do these species have in common?"
• Facilitate a 2-minute discussion, guiding students to observations about survival and extinction.
• Introduce today’s focus: Environmental changes drive evolution.

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2. Main Teaching (15 Minutes) – "Nature’s Selective Pressure"

Concept Breakdown (5 Minutes)

• Discuss:

  • Climate change and the Ice Age (e.g., woolly mammoths vs. modern elephants).
  • How pollution influenced moth colouration in the Industrial Revolution (peppered moths in the UK).
  • Rising ocean temperatures affecting marine life, such as coral bleaching.

• Emphasise natural selection:

  • Some individuals possess traits that help them survive.
  • Those traits are passed onto offspring, leading to species changes over generations.

Mini Experiment – "Be the Predator!" (10 Minutes)

• Objective: Simulate natural selection with a hands-on, competitive game.
• Materials: Two colours of paper dots (light & dark), two sheets of different coloured paper backgrounds.
• Activity:
  • Scatter mixed-colour dots on both sheets.
  • Students take turns acting as a predator, picking up as many dots as possible within 10 seconds.
  • Record which colour survives best on each ‘habitat’.
  • Discussion: Which dots had an advantage? How does this reflect real-world evolution?

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3. Application & Discussion (15 Minutes) – "Adapt, Move, or Die?"

• Present three environmental scenarios (e.g., deforestation, rising sea levels, extreme drought).
• Group Task:
  • In small teams, students assume they are a species under threat.
  • They must decide: Adapt, Move, or Face Extinction?
  • Each group shares their reasoning.
• Teacher-driven discussion on how human impact accelerates environmental change.

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Plenary (5 Minutes) – "Exit Ticket Challenge"

• Each student writes one sentence answering:
  “If you were a scientist studying evolution, what question would you want to answer next?”
• Collect and read out a few answers to inspire curiosity.

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Assessment

• Formative: Checking understanding through discussion and "Be the Predator" results.
• Summative: Evaluating reasoning in the group adaptation task.

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Differentiation

• Stretch & Challenge: Ask advanced learners how multiple environmental pressures may act together (e.g. habitat loss + climate change).
• Support: Provide sentence starters and encourage visual reinforcement for key concepts.

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Resources Needed

• Image slides (mammoth, elephant, dodo, peregrine falcon)
• Two coloured sheets of paper
• Small coloured paper dots
• Whiteboard & markers

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Teacher’s Reflection Notes

• Did students grasp the link between environment and evolution?
• Were they able to justify their adaptation choices?
• How did engagement vary between students?

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This lesson plan balances excitement, critical thinking, and hands-on interaction, ensuring students not only understand evolution but also apply it dynamically. 🚀