Carbon is formed in the cores of certain stars after lighter elements have been formed. The carbon on earth came from older stars that exploded to release their carbon.
On Earth, carbon is found as carbonate rocks, and dissolved in seawater as carbonic acid, and in the air as carbon dioxide. Plants and animals contain a small fraction of the Earth's total carbon.
There are many natural sources of Carbon Dioxide. These sources mainly come from respiration, decomposition and the ocean releasing carbon dioxide.
A source of carbon is any thing that releases carbon. Animals, plants and fossils are three main sources of carbon.
Some carbon sources are: plants, oceans, forests and lots of other things.
The main sources of carbon dioxide in the atmosphere is organisms. This is because the undergo cellular respiration that releases carbon dioxide.
Elements can not be created. The earth made carbon.
There are so many sources of carbon dioxide. Some of these sources include decomposition, burning of fossil fuels, release from the oceans and so much more.