Vocabulary

• Distinguished: adj. Successful and creditable
• Isolate: adj./v Different/unique, removed from society
• Evolution: n. The transformation of life from its earliest form until now
• Natural selection: n. The way that nature helps decide which traits are suitable for the environment
• Accumulation: v. Keep adding, increasing more
• Subpopulation: n. Individual population
• Struck: adj. Amazed

Summary

Evolution is a key theory in biology. It is the transformation of life from its earliest form until now.
Scientists use fossils and observations to research evolution. Scientists used Charles Darwin, a
scientist, who spent over 20 years studying different animals and their ancestors. He theorized two ideas. The first is that traits in animal species are heritable and natural selection. Natural selection is the way that nature helps decide which traits are suitable for the environment. These changes over time lead to big alterations of species.