Edexcel Biology Evolution Revision Notes

• 1Natural selection is the process where organisms better adapted to their environment tend to survive and produce more offspring.
• 2Genetic variation within a population is crucial for evolution, as it provides the raw material for natural selection.
• 3Speciation occurs when populations of the same species become isolated and evolve different traits.
• 4Fossil records provide evidence for evolution, showing how species have changed over time.
• 5Evolution can be influenced by environmental factors, leading to adaptations that enhance survival.

Evolution is how living things change over time. It happens because some traits help organisms survive better in their environment. Those that survive pass on their traits to their offspring, leading to gradual changes in the species. This is why we see so many different types of plants and animals today.