According to paragraph 5, which of the following is NOT true of the relationship between the bull s horn acacia tree and the Pseudomyrmex ants? A. Ants defend the host trees against the predatory actions of insects and animals. B. The acacia trees are a valuable source of nutrition for the ants. C. The ants enable the acacia tree to produce its own chemical defenses. D. The ants protect the acacia from having to compete with surrounding vegetation