in

3022 篇文章
Was found in the animals
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Was found in the animals 这些存在于其他动物身上

It still is for one person in four-
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It still is for one person in four- 这仍旧是世界上四分之一的人类

In a word, they became civilized.
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In a word, they became civilized. 一句话 他们变得文明了

It was a considerable leap in human history.
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It was a considerable leap in human history. 这是人类历史上质的飞跃

That abounded in fish, game and wild plants.
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That abounded in fish, game and wild plants. 富有鱼 猎物及野生植物的环境中生活

They chose to live in wet environments...
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They chose to live in wet environments... 他们选择了在湿润的

In the great adventure of life on earth,
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In the great adventure of life on earth, 在地球上生命的伟大冒险中

In perpetual movement toward the sky.
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In perpetual movement toward the sky. 自然界元素

In the chain of species,
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In the chain of species, 在物种链中

The earth counts time in billions of years.
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The earth counts time in billions of years. 地球以亿为单位计算时间