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相关概念视频

Phylogeny01:23

Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
Non-vascular Seedless Plants02:26

Non-vascular Seedless Plants

The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
What is Evolutionary History?02:35

What is Evolutionary History?

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.
The Evidence for Evolution02:55

The Evidence for Evolution

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.
The Fossil Record02:56

The Fossil Record

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...
Convergent Evolution01:54

Convergent Evolution

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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相关实验视频

Updated: May 13, 2026

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
04:55

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Published on: June 17, 2020

古生物学:非鸟类恐龙的"现代"羽毛

Mark Norell1, Qiang Ji, Keqin Gao

  • 1American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA. norell@amnh.org

Nature
|March 8, 2002
PubMed
概括

在非鸟类恐龙身上发现了带有中央轴和杆的羽毛. 这一发现表明,复杂的羽毛在鸟类和飞行之前就已经进化了.

科学领域:

  • 古生物学的古生物学
  • 进化生物学 进化生物学
  • 恐龙古生物学 恐龙古生物学

背景情况:

  • 发现恐龙的全身覆盖物是经常发生的.
  • 关于现代类型羽毛的确切证据以前仅限于少数特定物种.

研究的目的:

  • 描述非飞行类恐龙上的高级羽毛的发生.
  • 为了确定恐龙羽毛发育的进化时间表.

主要方法:

  • 化石的挖掘和分析.
  • 用显微镜检查皮肤结构.

主要成果:

  • 在中国的一种小型的非飞行类龙上发现了带有拉奇斯和巴巴斯的松羽毛.
  • 这些羽毛的结构类似于现代鸟类的羽毛.

结论:

  • 现代外观的羽毛是在鸟类起源之前在恐龙中演变的.
  • 羽毛的进化早于鸟类飞行的发展.

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Using Avian Skin Explants to Study Tissue Patterning and Organogenesis
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Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
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相关实验视频

Last Updated: May 13, 2026

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
04:55

Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats

Published on: June 17, 2020

Using Avian Skin Explants to Study Tissue Patterning and Organogenesis
09:30

Using Avian Skin Explants to Study Tissue Patterning and Organogenesis

Published on: September 15, 2023

Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography
07:30

Using Archival Japanese Paper and Thermoplastic Resins to Prepare Fossils for Storage, Display, Transport, and Radiography

Published on: November 14, 2025