Why is carbon so abundant in living things when oxygen is the most abundant element on earth?

Although oxygen constitutes 21% of the total atmospheric gases utilized by the organisms but carbon is the abundant element of the living organisms.

This happens because a living organism is composed of the smallest structural and functional unit called cell which is formed by the aggregation of the small molecule mostly which contains the carbon.

This is due to the reasons as the carbon element shows two properties called catenation sue to which carbon can form long chains by attaching the same carbon element and tetra-valency where the carbon can attach four different elements.

Thus, carbon is the abundant element of the living organism.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

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