The Nopoli rock-climbing goby uses mouthparts modified into a sucker to climb up waterfalls as tall as 330 feet. It also uses this sucker to scrape food off surfaces. Which of the following statements would be TRUE if we were to call the sucker an adaptation for climbing? The sucker evolved originally under selection for its feeding function and was later coopted for climbing. The sucker evolved originally under selection for its climbing function and was later coopted for feeding. The sucker evolved originally due to drift and was later coopted for feeding.

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Evolutionary adaptations

Evolutionary adaptation is the process through which organisms adapt or adjust to their surroundings to increase the chances of survival, mating, and reproduction. An organism's behavior, physiology, and structure are adjusted or changed to make it more suited to its environment.