Final answer:
Under certain conditions, natural selection and sexual selection can be opposing forces on the evolution of a male trait. One example of this is when a male trait that is favored by sexual selection is also maladaptive in terms of survival.
Step-by-step explanation:
Under certain conditions, natural selection and sexual selection can be opposing forces on the evolution of a male trait. One example of this is when a male trait that is favored by sexual selection is also maladaptive in terms of survival. For instance, in some bird species, males with long, elaborate feathers are preferred by females. However, these long feathers can make it harder for the males to evade predators, putting their survival at risk. This creates a situation where sexual selection and natural selection are in conflict.