Organic chemistry is the study of carbon based molecules, and those types are excellent for life because they allow for the formation of very large and complex molecules, with a very high number of configurations. Food sources have to be comprised of molecules that can be used by living organisms, and carbon based organic molecules can.
Carbohydrates.
when your food is converted into energy carbon dioxide is added to the blood stream and from there is exhaled out. i.e. when you breathe, oxygen in- carbon out
the carbon cycle
CO2 is heavier than air so it eventually drops to near the ground or, at least, stays low in the atmosphere where it is absorbed by plants that remove the carbon leaving oxygen. All food sources lead back to plants so we end up eating the carbon in the form of carbohydrates and proteins, among other things, metabolise it and breathe it out as carbon dioxide again. This is called the carbon cycle.
eating food
Animals breath out carbon dioxide which is made or obtained during cellular respiration. The carbon comes from food sources and the oxygen comes from inhaled air.
Animals are carbon based lifeforms; their celular structure is based on carbon atoms. Animals consume food made of organic molecules, which are based on carbon atoms. Animals breath out carbon dioxide, CO2. Yes, animals use carbon.
All life is carbon based. So if the food is or was once alive, then it is carbon based. Examples would be: Lobster, lettuce, fish, etc.
Yes, plant matter (aswel as us humans) are Carbon based lifeforms
Carbohydrates
All foods are rich in carbon. Life is carbon based. All organic molecules contain carbon. I can think of a few condiments that have no carbon (salt for example).
trophic levels :)
Carbohydrates.
All organic material (which includes food) is made up of carbon, so meat, vegetables, fruits, leaves all carbon based
Some bacteria, called autotrophs, make their own food from the carbon in CO2. Most bacteria are heterotrophs, taking their food 'ready-made' from other sources.
If one of the food sources were removed from a web then almost all the other animals would also die.
The Calvin cycle is a carbon dioxide gas from the atmosphere and the energy carried by ATP and NADPH to make simple sugars.