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After switching rotifers from one environment to another, differing in food type and sodium chloride concentration, Agrawal and Becks counted the number of offspring and assessed the genotype diversity of both sexually derived and asexually derived populations. Though other animal species, especially insects, occasionally experiment with total asexuality, these attempts are rarely successful. Sex allows species to adapt to the loss of food sources, the arrival of parasites, rising temperatures, and more. By ridding themselves of all their water, for example, desiccated rotifers can escape parasites simply by being blown away in the wind. Becks designed an experiment to see if a heterogeneous environment would promote sex in rotifers. Unisexual reproduction recombines two identical genomes, but the process itself is mutagenic, resulting in genetic diversity. This ran contrary to the Red Queen, which predicts that parasites would go after the most common genotypes, whether they are produced sexually or asexually. Upon infection and reproduction in their hosts, the worms sterilize the snails, putting the snails under strong selection pressure to evade the worms. So there must be some enduring benefit.

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