Carbon is a essential element for all life on earth. The primary function of the the Carbon Cycle is to exchange carbon throughout earth between the atmosphere,oceans,ecosystems, and geosphere. If the Carbon Cycle was to fail, then life on earth would begin to breakdown causing an end to all life on earth.
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The statement which explains why muscle cells and skin cells do not look and act the same is this: THE GENES IN EACH TYPE OF CELL ARE BEEN EXPRESSED DIFFERENTLY.
All the cells in human's body has the same set of genes, this is because, all the cells in the body originated from a single fertilized egg. Even though all the cells in the body has the same origin, they are different from one another because, the cells use the same set of genes differently.
