1. In Earth's early days, all over the planet countless photosynthetic bacteria performed photosynthesis.
在地球早期，整个星球上有无数的光合细菌在进行光合作用。
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2. Photosynthetic life is impossible there because sunlight is completely absent, but life such as the microbes that flourish deep within earth may still be possible.
3. The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
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4. The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.
24. Some photosynthetic bacteria are known to use infrared light, but—in contrast to plants andcyanobacteria—these microorganisms do not produce oxygen.
已经知道一些光合细菌能够利用红外光，但是和植物和蓝细菌不同，这些微生物光合的时候不能产生氧气。
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25. Some plants, such as soybeans, also store fats and can be used as fuel sources, but photosynthetic microbes produce nearly 250 times more fat per acre.
26. Internal factors such as kinds of pigments, enzyme levels, and the degree of organization of the photosynthetic apparatus also influence productivity.
内部因素，如色素种类、酶的水平和光合作用器官整体结构水平也影响植物的生产力。
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27. I think what they found here is a new modification of chlorophyll that shows the flexibility of photosynthetic organisms to use whatever light is available.
我认为他们发现的新叶绿素分子是叶绿素分子的一个新的修饰，它展示了不同光条件下光合生物的灵活性。
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28. Plants and cyanobacteria (also called blue-green algae), she says, “have evolved highly organized photosynthetic systems for the efficient oxidation of water.”
植物和蓝藻（又称蓝绿色藻类），她说，“已经进化为高度的有组织的光合系统以有效的氧化水。”
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29. Plants and cyanobacteria (also called blue-green algae), she says, “have evolved highly organized photosynthetic systems for the efficient oxidation of water.”
