Dates in this article are consensus estimates based on scientific evidence, mainly fossils. In biology, evolution is any change across successive generations in the heritable characteristics of biological …

Aug 6, 2025 · For a long time, critics argued that evolution was too slow to observe. But as the 20th century progressed, scientists began to see evolution happening in real time.

Apr 13, 2026 · Biological evolution is a process of descent with modification. Lineages of organisms change through generations; diversity arises because the lineages that descend from common …

You will also find a timeline of evolutionary history and information on some specific events in the history of life: human evolution and the origin of life.

Uncover how the scientific theory of evolution has continuously refined and expanded, integrating new findings to strengthen our understanding of life’s history.

It covers the study of changes organisms have undergone over time in response to different factors in their environment. All organisms, including humans, evolve over time.

During the period of human evolution, the Earth's climate has fluctuated between warm and cold. Some of the most important milestones in human evolution occurred during times of greatest fluctuations.

May 3, 2024 · This timeline of the evolution of life outlines the major events in the development of life on the planet Earth. Dates given are estimates based on scientific evidence.

This timeline of the evolution of life outlines the major events in the development of life on the planet Earth. For a thorough explanatory context, see the history of Earth, and geologic time scale.

Mar 13, 2026 · Evolution shapes populations over time through four key forces. Learn how species form, change, and what the fossil and DNA evidence tells us.