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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.
19 de set. de 2022 · Learn about the mysteries and challenges of understanding how life emerged on Earth 4.5 billion years ago. Explore the ingredients, theories and experiments that shed light on this scientific puzzle.
Since Earth is about 4.6 billion years old, these finds suggest that the origin of life must have occurred within a few hundred million years of that time. Chemical analyses on organic matter extracted from the oldest sediments show what sorts of organic molecules are preserved in the rock record.
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.
- Overview
- About this unit
- Formation of Earth and early life
- The diversification of life
- Radiometric dating
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About this unit
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
Formation of Earth and early life
How did Earth form, and what were early life forms like? Learn what we do (and don't!) know about the origins of our amazing planet and the dawn of its diverse inhabitants.
This unit is part of the Biology library. Browse videos, articles, and exercises by topic.
How did Earth form, and what were early life forms like? Learn what we do (and don't!) know about the origins of our amazing planet and the dawn of its diverse inhabitants.
Life began on Earth at least 3.5 billion years ago. Since then, it's diversified in an amazing way! Learn about important events in the history of living organism on Earth, up to and including the appearance of humans.
Geologists and archaeologists will tell you how old things are or when they happened, but how do they know? This tutorial covers some of the primary techniques of "dating" (in the geological, not the romantic, sense!).
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.
As origens da vida. Hipóteses sobre a origem da vida. Mundo do RNA. A diversificação da vida. A vida começou na Terra há pelo menos 3,5 bilhões de anos. Desde então, tem se diversificado de uma forma incrível! Aprenda sobre importantes eventos na história dos organismos vivos na Terra, até e incluindo o aparecimento dos seres humanos. Aprender.
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.
