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The timeline of the evolutionary history of life represents the current scientific theory outlining the major events during the development of life on planet Earth. Dates in this article are consensus estimates based on scientific evidence, mainly fossils.
The evidence is overwhelming that all life on Earth has evolved from common ancestors in an unbroken chain since its origin. Darwin’s principle of evolution is summarized by the following facts. All life tends to increase: more organisms are conceived, born, hatched, germinated from seed , sprouted from spores, or produced by cell division ...
Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. The similarities among all known present-day species indicate that they have diverged through the process of evolution from a common ancestor.
14 de jul. de 2009 · Timeline: The evolution of life. The story of evolution spans over 3 billion years and shows how microscopic single-celled organisms transformed Earth and gave rise to complex...
Instead life almost certainly originated in a series of small steps, each building upon the complexity that evolved previously: 1. Simple organic molecules were formed. Simple organic molecules, similar to the nucleotide shown below, are the building blocks of life and must have been involved in its origin.
Learn about the formation of Earth, the origins and diversification of life, and the methods of dating geological events. Explore videos, articles, and exercises on topics such as RNA world, ozone layer, eukaryotes, and human evolution.
Há 3 dias · The Earth underwent dramatic environmental changes during the critical early chapters of microbial evolution, roughly 4.0–2.0 billion years ago. As life responded to those changes, metabolic ...
