Cycle. Flow chart of the nitrigen cycle. Box 1: uppercase X. Box 2: Bacteria fix nitrogen from the air. Box 3: uppercase Y. Box 4: Consumers eat other organisms. Box 5: Decomposers break down dead organisms.

Which labels best complete the flow chart?

X: Producers undergo photosynthesis.
Y: Nitrogen compounds are released into the air.
X: Nitrogen compounds are released into the air.
Y: Producers undergo photosynthesis.
X: Free nitrogen is in the atmosphere.
Y: Producers absorb nitrogen compounds through their roots.
X: Producers absorb nitrogen compounds through their roots.
Y: Free nitrogen is in the atmosphere.