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AQASpec 4.6.3Foundation & Higher~25 min

Evolution & Classification

Biology · Topic revision workspace

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Topic overview

What you need to know

Evolution & Classification is a key part of GCSE Biology. Connect structures to their functions and explain biological processes as clear causal sequences. The process by which organisms with advantageous traits are more likely to survive, reproduce, and pass on their genes. The gradual change in the inherited characteristics of a population over many generations through natural selection. Proposed the theory of evolution by natural selection after studying finches on the Galápagos Islands.

Exam tip

Use precise scientific vocabulary and make each link in an explanation explicit.

Revision notes

Core ideas

Secure these ideas first. Say each definition in your own words, then connect it to the topic overview.

  • Natural Selection: The process by which organisms with advantageous traits are more likely to survive, reproduce, and pass on their genes.
  • Evolution: The gradual change in the inherited characteristics of a population over many generations through natural selection.
  • Charles Darwin: Proposed the theory of evolution by natural selection after studying finches on the Galápagos Islands.
  • Adaptation: A feature (structural, behavioural, or functional) that helps an organism survive in its environment.

Revision notes

Apply it in the exam

The exam will rarely ask for an isolated definition. Practise selecting the right idea and using it as part of a complete explanation or method.

  • Species: A group of organisms that can interbreed to produce fertile offspring.
  • Classification: Organising living organisms into groups based on shared characteristics. The Linnaean system uses: Kingdom, Phylum, Class, Order, Family, Genus, Species.
  • Extinction: When no living members of a species remain. Caused by environmental changes, new predators, new diseases, or competition.
  • Fossil Record: Preserved remains or traces of organisms from millions of years ago, providing evidence for evolution.

Core knowledge

Key facts for Evolution & Classification

1

Natural Selection

The process by which organisms with advantageous traits are more likely to survive, reproduce, and pass on their genes.

2

Evolution

The gradual change in the inherited characteristics of a population over many generations through natural selection.

3

Charles Darwin

Proposed the theory of evolution by natural selection after studying finches on the Galápagos Islands.

4

Adaptation

A feature (structural, behavioural, or functional) that helps an organism survive in its environment.

5

Species

A group of organisms that can interbreed to produce fertile offspring.

6

Classification

Organising living organisms into groups based on shared characteristics. The Linnaean system uses: Kingdom, Phylum, Class, Order, Family, Genus, Species.

7

Extinction

When no living members of a species remain. Caused by environmental changes, new predators, new diseases, or competition.

8

Fossil Record

Preserved remains or traces of organisms from millions of years ago, providing evidence for evolution.

Active recall

Close the notes and answer these

  1. 1.Without looking, explain natural selection and give one example or consequence.
  2. 2.Without looking, explain evolution and give one example or consequence.
  3. 3.Without looking, explain charles darwin and give one example or consequence.
  4. 4.Without looking, explain adaptation and give one example or consequence.

Content reviewed 23 July 2026 against the current linked specification.

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