Acacia plant with ants

Image source: By Ryan Somma CC BY 2.0, via Wikimedia Commons

Ants and acacia trees are involved in a symbiotic relationship where they both benefit. The tree provides food and shelter for the ants and in return the ants provide protection from herbivores for the plant. Neither organism can survive without the other. What type of symbiosis is this?

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Type a concept, like “slope” or “photosynthesis”.

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