Evolution is the change in the heritable characteristics of biological populations over successive generations. [1][2] It occurs when evolutionary processes such as genetic drift and natural …

Dec 9, 2025 · Evolution proceeds by the incremental acquisition of adaptations. It may be impossible for a lineage to evolve into a more effective way of life, because its present …

In this review, we summarize recent advances in the characterization of these ancestors, inferred by comparative genomic analyses between the earliest branching animals and those radiating …

Many scientists now believe that animals may in fact have evolved during the Cryogenian period. The Cambrian period, occurring between approximately 542–488 million years ago, marks the …

Apr 28, 2025 · Evolution explains how microscopic single-celled organisms eventually gave rise to the vibrant explosion of life we see today. It tells us how species adapt, survive, diverge, and …

Animal evolution describes the gradual process by which animal populations change over immense spans of time. This involves descent with modification, meaning species alive today …

Today we'll visualise the course of animal evolution in 16 major steps, cutting a path from the first clumps of cells wobbling about in the ocean to the hairy bipeds we are today.

Mar 14, 2025 · Learn what fossil evidence reveals about the origins of the first life on Earth, from bacteria to animals, including the phyla we know today.

Learn how today's big cats evolved from prehistoric cat-like organisms, and what factors contributed to their evolution. Learn about the evolution and hunting behaviors of sabertooth …

Dec 31, 2025 · Evolution, theory in biology postulating that the various types of living things on Earth have their origin in other preexisting types and that the distinguishable differences are …