The element or compounds that are present after a chemical change

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.

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Which of the following describes a situation where competition between producers exists