Assume you are studying the infection dynamics between a species of spider and a species of ringworm that infects the spider. You sequence the genomes of each species for 30 years and find that each of these species has evolved adaptations. Specifically, the spider has evolved immune system adaptations to remove the ringworm and the ringworm has evolved counter-adaptations to evade the spider's immune system. Surprisingly, you find that the ability of the ringworm to infect the spider has not changed over 30 years. The finding that infectiousness has not changed in 30 years would be in support of which of the following?

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