The theory of evolution can be defined as
The theory of evolution can be defined as
Explanation
Evolution is the process where species change gradually over many generations through natural processes. These changes happen because of natural selection, genetic mutations, and environmental pressures. Species that survive pass helpful traits to their offspring.
Evolution does not happen because organisms try to improve themselves. Changes occur randomly through mutations in DNA. If a change helps an organism survive better, that trait becomes more common in future generations.
The theory rejects the idea that species never change from their original form. Evolution also usually happens slowly over millions of years, not through sudden dramatic changes. Fossil evidence and DNA studies support gradual change over time.