Plants called legumes have chambers in their roots that house nitrogen- fixing bacteria. Nitrogen- fixing bacteria get both a place to live and energy while supplying nitrogen to a plant. What is this ecological relationship called?

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This ecological relationship is called mutualism, where both organisms involved benefit from the relationship. In this case, the nitrogen-fixing bacteria get a habitat and energy, while the plant receives nitrogen.

Plants Called Legumes Have Chambers in Their Roots That House