The following diagram represents the reaction of methane with oxygen gas to form carbon dioxide and water. The chemical reaction shown above takes place in a closed system. What is true about the system while the reaction occurs?

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form