A student is developing a model of the carbon cycle, which involves the movement of carbon among various Earth systems. She begins by drawing the diagram shown below. What does arrow 1 represent? Atmospheric Carbon (CO, gas) Item 13 Item 14 Item 15 Item 16 Item 17 Item 18 Item 19 COURSE TOOLS Forest Fire Dissolved CO, 5 Item 20 < 6 Carbonate Rocks Fossil Fuels (coal, oil, and natural gas) Green Algae Carbon in Marine Sediments. (1 point) Cellular Respiration Photosynthesis Combustion Consumption

Answer 1

In the context of the carbon cycle, arrow 1 would represent photosynthesis. This process involves plants, algae, and some bacteria absorbing carbon dioxide (CO₂) from the atmosphere and, using sunlight, converting it into organic matter (glucose) while releasing oxygen. In your model of the carbon cycle, if arrow 1 connects atmospheric carbon (CO₂ gas) to another component such as forest cover or marine plants (like green algae), it likely denotes the uptake of CO₂ by these organisms during photosynthesis.