amniote

简明释义

英[ˈæmnɪəʊt]美[ˈæmnioʊt]

n. [脊椎] 羊膜动物；脊椎动物

英英释义

单词用法

同义词

反义词

例句

1.Birds are classified as amniotes 羊膜动物 because they lay eggs with protective membranes.

鸟类被归类为羊膜动物，因为它们产下具有保护膜的卵。

2.Mammals are also considered amniotes 羊膜动物 due to their unique reproductive strategies.

哺乳动物也被认为是羊膜动物，因为它们独特的繁殖策略。

3.Reptiles, including snakes and lizards, are examples of amniotes 羊膜动物 that adapted to terrestrial life.

包括蛇和蜥蜴在内的爬行动物是适应陆地生活的羊膜动物的例子。

4.The evolution of the amniote 羊膜动物 group allowed for reproduction in dry environments.

羊膜动物组的进化使得它们能够在干燥的环境中繁殖。

5.The presence of an amniotic sac is a key feature of amniotes 羊膜动物 that allows embryos to develop in a protected environment.

羊膜囊的存在是羊膜动物的一个关键特征，使胚胎能够在受保护的环境中发育。

作文

The term amniote refers to a group of animals that are characterized by the presence of an amnion during their development. This group includes reptiles, birds, and mammals. The evolution of the amniote lineage was a significant milestone in the history of life on Earth, as it allowed these animals to reproduce in a variety of terrestrial environments without the need for a water source for their eggs. The amnion is a protective membrane that surrounds the embryo, providing a stable environment that is crucial for its development. This adaptation is one of the key differences that set amniotes apart from their ancestors, the amphibians, which typically lay their eggs in water. In evolutionary biology, understanding the characteristics of amniotes helps scientists trace back the lineage of various species and comprehend how they have adapted to their environments over millions of years. For instance, the transition from aquatic to terrestrial life required several physiological changes. The development of the amniotic egg was one of the most important adaptations that facilitated this transition. The egg's structure allows for gas exchange while retaining moisture, which is essential for the developing embryo. Among the amniotes, reptiles were the first to fully exploit terrestrial habitats. They developed scales to prevent water loss and laid eggs with hard shells, which provided additional protection against desiccation. Birds, which evolved from theropod dinosaurs, also belong to the amniote group. They exhibit unique adaptations such as feathers and hollow bones, which enhance their ability to fly. Mammals, another branch of amniotes, have further diversified, with some species giving birth to live young rather than laying eggs. This reproductive strategy is thought to provide greater protection and care for the developing offspring. The study of amniotes is not only fascinating from an evolutionary perspective but also has implications for understanding modern biodiversity. By examining the anatomical and genetic traits of these animals, researchers can gain insights into how species adapt to changing environments, which is particularly relevant in the context of climate change today. For example, some amniote species are facing extinction due to habitat loss and changing climates, making it crucial to understand their biology and ecology for conservation efforts. In summary, the concept of amniote is central to our understanding of vertebrate evolution and adaptation. The innovations that arose within this group paved the way for the diverse array of life forms we see today. From the protective features of the amniotic egg to the various reproductive strategies employed by different amniotes, these adaptations highlight the remarkable journey of life on land and the ongoing challenges faced by these species in a rapidly changing world.

术语amniote指的是一类动物，它们的发育过程中具有羊膜的特征。这一类动物包括爬行动物、鸟类和哺乳动物。amniote谱系的进化是地球生命历史上的一个重要里程碑，因为它使这些动物能够在各种陆地环境中繁殖，而无需依赖水源来孵化它们的卵子。羊膜是围绕胚胎的保护膜，为其发育提供了稳定的环境，这种适应性是将amniotes与其祖先两栖动物区分开的关键差异之一。在进化生物学中，理解amniotes的特征有助于科学家追溯各种物种的谱系，并理解它们如何在数百万年的时间里适应环境。例如，从水生到陆生生活的过渡需要一些生理变化。羊膜卵的形成是促进这一过渡的重要适应之一。卵的结构允许气体交换，同时保持湿度，这对正在发育的胚胎至关重要。在amniotes中，爬行动物是第一个完全利用陆地栖息地的动物。它们发展出鳞片以防止水分流失，并产下具有坚硬外壳的卵，这为抵御干燥提供了额外的保护。鸟类从兽脚亚目恐龙进化而来，也属于amniote组。它们展现出独特的适应性，如羽毛和中空骨骼，这增强了它们飞行的能力。哺乳动物，作为amniotes的另一个分支，进一步多样化，其中一些物种选择活产而非产卵。这种繁殖策略被认为为正在发育的后代提供了更好的保护和照顾。对amniotes的研究不仅在进化角度上令人着迷，而且对理解现代生物多样性也有重要意义。通过检查这些动物的解剖学和遗传特征，研究人员可以深入了解物种如何适应变化的环境，这在今天气候变化的背景下尤为相关。例如，一些amniote物种因栖息地丧失和气候变化而面临灭绝，因此理解它们的生物学和生态学对保护工作至关重要。总之，amniote的概念是我们理解脊椎动物进化和适应的核心。这一组内产生的创新为我们今天看到的多样生命形式铺平了道路。从羊膜卵的保护特征到不同amniotes采用的各种繁殖策略，这些适应性突显了陆地生命的非凡旅程以及这些物种在快速变化的世界中面临的持续挑战。