Evolution
Evolution is the gradual change in the inherited features of a species over many generations, leading to new species.
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Evolution is the gradual change in the inherited features of a species over many generations, leading to new species.
- Fossils provide evidence
- DNA comparisons show relationships
- Speciation happens when populations separate
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Evolution?
Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains Evolution. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.
Check that you can explain Evolution in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Evolution helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
Evolution in detail
Evolution is the gradual change in the inherited characteristics of populations over many generations, resulting from natural selection acting on variation. Over long periods, it can form new species, when populations become isolated and so different that they can no longer interbreed.
All living things share a common ancestor, supported by evidence from fossils, DNA similarities and comparative anatomy. Darwin and Wallace proposed the theory, which was at first controversial, but is now supported by overwhelming evidence. Evolution explains the diversity of life and how organisms are adapted to their environments.
How the interactive helps you understand Evolution
Watch the timeline in the interactive. Use any sliders or buttons it offers to change the values and see how the timeline responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Evolution.
Real-life uses and examples
- Structure a longer answer about Evolution by moving from definition to example to consequence.
- Explain how Evolution helps a living thing stay alive, using a plant or animal example.
- Connect Evolution to health, food and medicine in everyday life.
Common mistakes to avoid
- Listing the steps of a process without saying how one step causes the next.
- Using everyday words, such as “energy” or “bad”, without their scientific meaning.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Evolution
What is Evolution?
Evolution is the gradual change in the inherited features of a species over many generations, leading to new species.
What are the most important points about Evolution?
The main points are: Fossils provide evidence; DNA comparisons show relationships; Speciation happens when populations separate.
Why is Evolution useful?
Understanding Evolution helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
How can I practise Evolution?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Evolution?
Related topics in Biology include Selective Breeding, Ecosystems and Habitats, The Carbon Cycle.