The two possible benefits of alley cropping in the rainforest are:
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Increased biodiversity - Alley cropping can enhance biodiversity by providing habitat for various species and promoting a variety of plant growth.
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Maintenance of soil's nutrients - Alley cropping can help maintain soil nutrients by incorporating various plants that can fix nitrogen and adding organic matter to the soil through plant residues.
The other options (increased use of chemical fertilizers, decreased carbon storage, and quick results) do not align with the typical benefits of alley cropping.