AP BIOLOGY

Detailed explanation-1: -For an organism to become a fossil, it must not decompose or be eaten. This can happen if the organism either lives within or is moved to a place where it can be buried and kept from decaying.

Detailed explanation-2: -Dead organisms and waste products decay bringing the carbon into the ground. Overtime (millions of years) and under the right conditions some decomposed remains will be turned into fossil fuels such as coal and gas.

Detailed explanation-3: -When animals eat food, they get carbon in the form of carbohydrates and proteins. In animals, oxygen combines with food in the cells to produce energy for daily activity and then gives off carbon.

Detailed explanation-4: -When the animals die, they decompose, and their remains become sediment, trapping the stored carbon in layers that eventually turn into rock or minerals. Some of this sediment might form fossil fuels, such as coal, oil, or natural gas, which release carbon back into the atmosphere when the fuel is burned.