To complete the flow chart of the carbon cycle, we need to identify the processes that fit logically into the sequence.
- Box 1: Carbon dioxide in the atmosphere
- Arrow: This arrow likely leads to Box 2, which involves X.
- Box 2 (X): This box should describe how carbon dioxide is utilized by producers. The most appropriate label here is "Producers undergo photosynthesis," as this is how plants absorb carbon dioxide from the atmosphere.
- Box 3: Consumers eat producers. This step represents the transfer of carbon through the food chain.
- Arrow: This arrow leads to Box 4, which involves Y.
- Box 4 (Y): This box should describe how decomposers handle carbon after consumers die or waste is produced. The appropriate label here is "Decomposers return carbon to the soil and release waste," as this describes the process of decomposition.
Therefore, the best labels to complete the flow chart are:
X: Producers undergo photosynthesis.
Y: Decomposers return carbon to the soil and release waste.