Discussion and talking about CO2 and where it came from. My follow up question is a 'Big picture' question. The CO2 we exhale is used within the environment by plants. Expand your post and discuss how it is used and what pathways are linked between us and other species because of it?
USE; Simon, Eric J. (2014). Biology: The Core (1st ed.). Benjamin Cummings. eBook MasteringBiology.