Evolutionary processes give rise to diversity at every level of biological organization, from kingdoms to species, and individual organisms and molecules, such as DNA and proteins. The …

Jan 30, 2020 · Learn about the evolution of vertebrate animals, from tiny proto-fish 500 million years ago to the birds, mammals, and reptiles of today.

Mar 21, 2025 · Animals first appeared in the Ediacaran Period (about 635 million to 541 million years ago), soft-bodied forms that left traces of their bodies in shallow-water sediments. The …

What were the earliest members of the animal kingdom, and what organism was their common ancestor? While animal diversity increased during the Cambrian period of the Paleozoic era, …

Sep 23, 2022 · The animal kingdom is one of life's greatest success stories, a collection of millions of species that swim, burrow, run and fly all over the planet. All this diversity, from …

Mar 14, 2025 · The First Animals. These clusters of specialized, cooperating cells eventually became the first animals, which DNA evidence suggests evolved around 800 million years …

5 days ago · evolution, theory in biology postulating that the various types of plants, animals, and other living things on Earth have their origin in other preexisting types and that the …

Monkeys to humans, the evolution of life is a story with surprising twists. Earth has been home to over five billion different species of organisms. Of all of those living life forms, an estimated …

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 …

Feb 28, 2025 · The Wood Canyon Formation in Mojave National Preserve spans the Precambrian–Cambrian boundary. NPS photo by Justin Tweet. The Cambrian explosion was …