The most immediate effect of sexual displays and contests in animals (such as bighorn sheep bashing their heads together)is:

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Sexual displays and contests often involve attracting and competing for mating partners, leading to differential mating success. Individuals with better displays or greater fighting ability are more likely to mate and pass on their genes, resulting in natural selection for those traits. The other choices, mutations, disruptive selection, and stabilizing selection, are not directly related to sexual displays and contests.

The Most Immediate Effect of Sexual Displays and Contests in Animals