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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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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 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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Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Related Experiment Video

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Cycles in fossil diversity.

Robert A Rohde1, Richard A Muller

  • 1Department of Physics and Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720, USA.

Nature
|March 11, 2005
PubMed
Summary

Life's diversity shows a significant 62-million-year cycle during the Phanerozoic eon. This pattern, evident in marine genera, may explain major extinction events.

Area of Science:

  • Paleontology
  • Marine Biology
  • Geological Time Scales

Background:

  • Life diversity fluctuates throughout the Phanerozoic eon (0-542 million years ago).
  • Abundant fossil records of marine genera with hard shells and skeletons exist from this period.

Observation:

  • Analysis of Sepkoski's compendium, detailing 36,380 marine genera's first and last appearances.
  • A distinct cyclical pattern in marine biodiversity was identified.

Findings:

  • A strong 62 +/- 3-million-year cycle in marine genus diversity was discovered.
  • This cycle is particularly pronounced in genera with shorter lifespans.
  • The five major extinction events may be part of this long-term cycle.

Implications:

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  • Understanding long-term biodiversity cycles is crucial for evolutionary biology.
  • The findings suggest potential environmental drivers influencing mass extinctions.
  • Further research into environmental factors and their cyclical impact is warranted.