Final answer:
Turtles, whales, and seals are examples of nekton, which are organisms that can actively swim and move independently in the water.
Step-by-step explanation:
Turtles, whales, and seals are examples of nekton. Nekton refers to organisms that can actively swim and move independently in the water, such as fish, whales, and dolphins. They are often considered to be the larger and more highly-mobile organisms in aquatic ecosystems.
Learn more about Types of aquatic organisms