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The Colonization of Land02:22

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Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
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Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
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The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
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Related Experiment Video

Updated: Sep 29, 2025

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples
07:24

In Situ Hybridization Techniques for Paraffin-Embedded Adult Coral Samples

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The Evolution of Invertebrate Animals.

Stephanie Bertrand1, Hector Escriva1

  • 1Sorbonne Université, CNRS, Biologie Intégrative des Organismes Marins, BIOM, Observatoire Océanologique, F-66650 Banyuls-sur-Mer, France.

Genes
|March 25, 2022
PubMed
Summary

Metazoan diversity evolved over a billion years from unicellular ancestors. This evolutionary journey shaped the vast array of animal life seen today.

Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Paleontology

Background:

  • The origin and diversification of metazoans trace back approximately 1000 million years (Mya) to their unicellular ancestors.
  • Understanding the evolutionary trajectory of metazoans is crucial for comprehending the history of life on Earth.

Discussion:

  • The long evolutionary process has led to the current rich diversity of animal forms.
  • Investigating the early stages of metazoan evolution provides insights into fundamental biological processes.

Key Insights:

  • Metazoan evolution is a testament to gradual change and diversification over immense timescales.
  • The transition from unicellular to multicellular life marked a pivotal event in Earth's biological history.

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Outlook:

  • Future research can further elucidate the genetic and developmental mechanisms driving metazoan diversification.
  • Continued exploration of the fossil record and comparative genomics will refine our understanding of early animal evolution.