What effect does deforestation have on carbon dioxide levels in the atmosphere?

The correct option is It increases carbon dioxide by reducing photosynthesis.. This answer is correct because it matches the approved learning objective to explain that deforestation increases carbon dioxide by reducing photosynthesis and by burning or decomposing biomass in the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere.

The correct option is It increases carbon dioxide by reducing photosynthesis.. It increases carbon dioxide by reducing photosynthesis. is correct because it directly supports the approved learning objective to explain that deforestation increases carbon dioxide by reducing photosynthesis and by burning or decomposing biomass. This belongs to the subtopic Human activities which contribute to an increase in greenhouse gases in the atmosphere within Carbon dioxide and methane as greenhouse gases, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Human activities which contribute to an increase in greenhouse gases in the atmosphere.