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The Colonization of Land02:22

The Colonization of Land

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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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Non-vascular Seedless Plants02:26

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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.
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What is Evolutionary History?02:35

What is Evolutionary History?

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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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The Evidence for Evolution02:55

The Evidence for 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 Fossil Record02:56

The Fossil Record

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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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Role of Water in Human Biology01:27

Role of Water in Human Biology

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Water is the one of the most significant components of the human body; it plays a crucial role in several physiological activities because of its unique physicochemical properties. Importantly, it helps to regulate body temperature and is the chief component of several body fluids.
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Since water is a polar molecule with slightly positive and slightly negative charges, ions and polar molecules can readily dissolve in it. Therefore, it is referred to as a solvent, a...
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相关实验视频

Updated: May 7, 2026

Use of Chironomidae Diptera Surface-Floating Pupal Exuviae as a Rapid Bioassessment Protocol for Water Bodies
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在白纪早期发现的水 (Nymphaeales) 的化石证据.

E M Friis1, K R Pedersen, P R Crane

  • 1Department of Palaeobotany, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden. else.marie.friis@nrm.se

Nature
|March 27, 2001
PubMed
概括
此摘要是机器生成的。

化石花结构揭示了ANITA分类植物的最早证据,将水 (Nymphaeales) 的历史延伸到白纪早期. 这一发现使分子数据与早期血管种的化石记录保持一致.

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科学领域:

  • 古植物学是古植物学.
  • 血管精子的原始发育过程

背景情况:

  • 遗传学分析将水 (Nymphaeales) 和ANITA分类列为早期的血管精子系.
  • 在早期的白纪层中,对于这些基底苗的化石证据很少.

研究的目的:

  • 报告与ANITA类相关的植物最早的明确化石证据.
  • 为了将Nymphaeales的化石记录延伸到白纪早期.

主要方法:

  • 对化石花结构和相关花粉的分析.
  • 化石组合的日期包含明确的血管精子茎和骨.

主要成果:

  • 发现最古老的化石证据与ANITA类联系在一起.
  • 延长了Nymphaeales的化石记录到1.25亿至1.15亿年前.
  • 在最古老的化石组合中发现具有明确的血管精子生殖结构.

结论:

  • 化石记录现在支持基于分子的血管精子族系.
  • 早期的血管精子花朵很可能很小,与之前的观察一致.