In the atmosphere as Carbon Dioxide (Co2)
Underground as fossil fuels and calcium carbonate rock
In the oceans as dissolved Co2
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An aquarium IS an example of a biosphere.
CARBON
Hi, The toucans and snakes live in a biosphere where it is sunny and wet.
carbon is most abundant in all earths bodies of water (approx 36,000 gigatonnes) compared with the biosphere (1,900 gigatonnes), hydrocarbons (1050 gigatonnes) and the atmosphere (810 gigatonnes), plus other smaller sources but generally water contains the most carbon.
ecosystem .