Which environmental factor could lead to a decrease in genetic variation in a population of tuna? an increase in food availability an increase in pollution a decrease in tuna fishing a decrease in tuna predators

The answer of the given question would be the second option. The environmental factor that could lead to a decrease in genetic variation in a population of tune is an increase in pollution. The option that only shows an environmental factor is pollution. The effect of pollution on the population of fish is that it leads to some damaging effects that affects the life cycle of the fish.