All of these components are reservoirs of carbon. The cycle is usually discussed as four main reservoirs of carbon interconnected by pathways of exchange. The reservoirs are the atmosphere, terrestrial biosphere (usually includes freshwater systems), oceans, and sediments (includes fossil fuels).
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Answer: The bone should become spongy, cartilagenous, and springy.
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http://images.pcmac.org/SiSFiles/Schools/CA/SMJUHSD/PioneerValleyHigh/Uploads/DocumentsCategories/Documents/Lab%2012.PDF
The bird species has presumably adapted to the conditions after the forest fire if they're still alive. They might have found a new shelter to live at and foods to eat and make it durable for the time period remaining to keep surviving.