<span>Both photoautotrophs and chemoautotrophs synthesize organic compounds from (inorganic) carbon dioxide, a process known as carbon fixation. Photoautotrophs get the energy to perform these reactions from light. Chemoautotrophs get it from electron donors such as hydrogen sulfide and ammonia. Cyanobacteria, by contrast, convert nitrogen from the atmosphere into ammonia, a process known as nitrogen fixation.</span>
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These <span>large leaves of ferns that show multiple venation are called fronds.</span>
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When populations have differences in rituals or behaviors. When populations are separated by rivers, mountains, r bodies of water.
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