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26. Azteca ants and Cecropia obtusifolia trees form a mutualism: the ants defend the trees from herbivores and the trees provide food and shelter for the ants. In which situation would the mutualism no longer be maintained by selection? a. There is no cost for the trees to produce food for the ants. b. There are no predation risks to the ants when they defend the tree. c. There are no herbivores present. d. The food provided by the trees is the only source of food for the ants.

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