Rosa drew a flow chart of the carbon cycle. the carbon cycle with 4 boxes connected by arrows. box 1: carbon dioxide in the atmosphere. box 2: x. box 3: consumers eat producers. box 4: y. the arrow that follows box 4 connects to box 1. which labels best complete the flow chart? x: producers undergo photosynthesis. y: decomposers return carbon to the soil and release waste. x: decomposers return carbon to the soil and release waste. y: producers undergo photosynthesis. x: decomposers take in carbon dioxide. y: producers absorb carbon through their roots. x: producers absorb carbon through their roots. y: decomposers take in carbon dioxide.