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Howard Clark, Ryde Like other things in life, breathing isn't that simple.
What we breathe in is far from pure oxygen, but roughly by volume 78 per cent nitrogen, 21 per cent oxygen, 0.965 per cent argon and 0.04 per cent carbon dioxide (plus some helium, water and other gases).
It is an intrinsic part of life on Earth, and its importance cannot be undermined. Humans and animals need Carbon for their metabolism, in the form of carbohydrates.
Carbon is also the key ingredient of fossil fuels, petroleum, is used in Carbon-dating, etc.
The carbon cycle shows how carbon moves from the atmosphere, through various animals and plants, then back into the atmosphere again.
Paul Roberts, Lake Cathie The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat.
Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all.
By taking a two plants of the exact same species, de-starching them both followed by putting plant one in conditions where carbon dioxide is taken away completely, and plant two will then be put in conditions where carbon dioxide is added, after a day or two in these conditions leaves from both plants will be tested for starch, if the leaf tests positive for...
The carbon then becomes part of these microorganisms and detritus feeders.
Jim Dewar, North Gosford The carbon dioxide breathed out is a by-product of the process of cell respiration, as is water. Glucose plus oxygen produces carbon dioxide, water and energy. John Blackhawk, Umina Beach The food and drink we eat can be broken into carbon compounds, one of the most simple being glucose (C6H12O6).
So without Carbon-dioxide, plants wouldn't make food, and we would have no direct source of energy for our own survival. So, thanks to Carbon and the compounds that it forms, we are here to understand the Carbon cycle.