The symbol t represents change in while x represents change in

Someone, part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.

The answer for #3 is c but i don't know why

What is the common name for the compound shown here? enter the common name of the compound shown?