Prior to 1960, Lake Washington was highly polluted and underwater visibility was limited to one or two meters. In the late 1960s, a large cleanup effort reduced pollution, resulting in visibility that increased to six to seven meters by 1976. Which of the following best explains how the change in underwater visibility affected armor plating in Lake Washington sticklebacks between 1957 and 1976 ?

The correct answer would be - increase in susceptible to large-toothed predators which is selective advantage.

Explanation:

The pollution was high before 1960 the visibility due to the high-level pollution was very low almost one or two meters. After 1960 the pollution cleaning effort was made and due to this, the visibility becomes six to seven meters.

The change that made during this period helps the sticklebacks more susceptible to the predators with large tooth which provide the selective advantage to the armor of sticklebacks.

Thus, the correct answer is -  increase in susceptible to large-toothed predators which is selective advantage.

the missing space is phylum