Their unique physiological adaptations let the crab harvest large clusters of bacteria that grow on the surfaces of hydrothermal vent chimneys. They spend most of their lives in the water heated by the vents, and the crabs are unable to move between vents due to the stark difference in water temperature.
It has an effect on the speaker by using these repetitive words to get a point across that there is more to come because nevermore is kind of a synonym to the word anyway in some respects <span />
