Our atmosphere is full of it thanks to plants and photosynthetic bacteria.

多亏了植物和进行光合作用的细菌，我们的大气中充满了碳水化合物。

Despite looking like weird plants, lichens are actually fungal hybrids that house their own algae or photosynthetic bacteria.

尽管看起来像奇怪的植物，但地衣实际上是真菌的杂交体，它们拥有自己的藻类或光合细菌。

And billions of years ago, these stromatolites, ancient communities of photosynthetic bacteria that are equal parts biology and geology, may have exhaled the first breaths of life-giving oxygen.

数十亿年前的这些叠层石，古老的光合细菌群落，它们在生物学和地质学中是一样的部分，可能已经呼出了第一口提供生命的氧气。