Evolution and Traces of Life

A Question at the Heart of Science

What is life? The question is dizzying, as it touches on both philosophy and biology. For centuries, humans have tried to understand what distinguishes a living being from an inanimate object. Life appears as a complex phenomenon, shaped by a multitude of parameters that sometimes make its origin, evolution, and forms difficult to define.

An Essential Biological Definition

Despite this complexity, biology offers an operational definition: an organism is considered alive when it exchanges matter and energy with its environment, maintains a certain autonomy, reproduces, and evolves through natural selection. All living beings, from bacteria to mammals, ensure their stability by reacting to changes in their environment.

Traces of Life and Their Evolution Over Time

The study of evolution and traces of life allows us to retrace the history of life on Earth. Fossils, footprints, organic molecules, and microscopic structures bear witness to the successive transformations of organisms over billions of years. Understanding these traces means exploring the dynamics of life, its adaptations, its crises, and the mechanisms that have shaped current biodiversity.

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