The concept of a "coevolutionary arms race" can be best described as: Two species that have coevolved will become less antagonistic over time. A pathogen with a long coevolutionary history with the host will evolve to be less virulent on that host. When a prey species evolves defenses, the predator will switch prey species. Evolutionary changes in a prey species that make it better defended against a predator will select for traits in the predator that will counteract those defenses, and vice versa.
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