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 …

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 …

Nov 29, 2025 · Invasive species are a major driver of extinction and have been on the rise for the last 200 years. The threat posed by invasives have prompted many efforts to eliminate them, …

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 …

Jul 19, 2025 · Life had already exploded in complexity during the Cambrian period, a time when evolution seemed to burst forth in technicolor. The seas were full of soft-bodied organisms, …

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 …

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 …

Jan 1, 2026 · The earliest animals evolved from colonial protists more than 600 million years ago. Many important animal adaptations evolved in invertebrates, including tissues and a brain.