Evolution

Short Definition

Evolution is the process by which species change over time through natural selection and genetic variation.

Detailed Explanation

Evolution explains the diversity of life on Earth. It occurs gradually over generations as organisms adapt to their environment. Key mechanisms include mutation, natural selection, genetic drift, and gene flow.

Evidence of Evolution

• Fossil records showing changes over time
• Comparative anatomy and homologous structures
• Embryology and developmental similarities
• Molecular biology and DNA comparisons

Importance

Understanding evolution helps explain the origin of species, adaptation, and the relationships among living organisms.