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.