Bilateral animals flourished in the Cambrian so tracing their origins is crucial to understanding the pace of animal evolution.

两侧对称动物在寒武纪繁衍旺盛，因此追踪它们的起源对了解动物是如何进化而来的十分重要。

youdao

The origin of the vertebrates is one of the most important transitions in animal evolution.

脊椎动物的出现是动物 进化历史上一次质的 飞跃。

youdao

The results indicated that Macrostomum tuba is an ideal experimental material for the study of animal evolution.

研究结果提示：大口涡虫是涡虫纲教学和动物进化研究的理想实验材料。

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He is being honored for his work on animal evolution and the origins of biological complexity.

VOA: special.2011.05.10

He said the findings provided a new insight into the evolution of this animal.

BBC: Giant camel fossil found in Arctic

The meeting brought together 55 ASPnet students and teachers from 4 countries (Andorra, Portugal, Spain and United States of America) to launch the 2010 International Year of Biodiversity with students and a teacher from each country presenting their research on topics including Evolution, Biodiversity and Sustainability, Sustainability of the Systems of Animal Production, Public Health and Fight Against Poverty and Protected Areas and Biodiversity Maintenance.

UNESCO: Education