Biogeo cycles

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Biogeo cycles

  1. 1. Biomes<br />Terrestrial biomes <br />Land biomes<br />
  2. 2. What abiotic and biotic factors characterize a biome?<br />Biomes are described in terms of abiotic factors like climate and soil type and biotic factors such as animals and plants.<br />
  3. 3. Carbon Cycle<br />
  4. 4. .<br />
  5. 5. Nitrogen Cycle<br />
  6. 6. Oxygen Cycle<br />If you look back at the carbon cycle, you will see that we have also described the oxygen cycle, since these atoms often are combined. Oxygen is present in the carbon dioxide, in the carbohydrates, in water, and as a molecule of two oxygen atoms. <br />Oxygen is released to the atmosphere by autotrophs during photosynthesis and taken up by both autotrophs and heterotrophs during respiration. In fact, all of the oxygen in the atmosphere isbiogenic; that is, it was released from water through photosynthesis by autotrophs. It took about 2 billion years for autotrophs (mostly cyanobacteria) to raise the oxygen content of the atmosphere to the 21% that it is today; this opened the door for complex organisms such as multicellular animals, which need a lot of oxygen.<br />

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