Which of the following types of organisms does anti-fouling coating protect against?

Anti-fouling coatings are specifically designed to prevent the growth of various marine organisms on the hulls of boats and ships. These coatings are particularly effective against organisms like barnacles, algae, and other sea life that tend to attach themselves to underwater surfaces. The primary goal of anti-fouling technology is to maintain the efficiency and performance of boats by preventing these growths that can create drag, reduce speed, and lead to increased fuel costs.

Marine organisms, such as barnacles and algae, are a significant concern for vessel maintenance, as they can cause damage to hulls over time, leading to higher maintenance costs and reduced operational efficiency. Therefore, the correct choice highlights the specific purpose of anti-fouling coatings in combating these particular types of organisms found in aquatic environments, ensuring vessels remain in optimal condition while navigating through water.