All true plants, from tiny green algae to giant redwoods,
use the energy of sunlight to build carbon compounds out
of carbon dioxide and produce
oxygen as a metabolic
waste product in a process
called photosynthesis. In
this way, emerging life
dramatically changed the very composition and appearance
of Earth’s surface—the first of many such widespread
modifications imposed on Earth by living organisms.
Earth’s atmospheric oxygen content is held in a delicate balance
primarily by plants. If plant life on the planet were to
disappear, so, too, would nearly all of Earth’s atmospheric
oxygen, and all other life on Earth as well.
All true plants, from tiny green algae to giant redwoods,use the energy of sunlight to build carbon compounds outof carbon dioxide and produceoxygen as a metabolicwaste product in a processcalled photosynthesis. Inthis way, emerging lifedramatically changed the very composition and appearanceof Earth’s surface—the first of many such widespreadmodifications imposed on Earth by living organisms.Earth’s atmospheric oxygen content is held in a delicate balanceprimarily by plants. If plant life on the planet were todisappear, so, too, would nearly all of Earth’s atmosphericoxygen, and all other life on Earth as well.
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