Which of the following best describes a flounder?

The flounder is characterized by its unique physiological adaptation that allows it to blend in with the ocean floor. This fish is flat and has both eyes on one side, enabling it to lie almost entirely on the seabed while still being able to observe its surroundings for predators and prey. This adaptation is crucial for its survival, as it relies on camouflage to avoid detection from both hunters and prey. The description of having eyes sticking up from the sand captures this distinctive feature, emphasizing the flounder's habit of remaining partially buried while staying alert.

The other descriptions do not accurately reflect the flounder's physical traits or behavior, highlighting why they are not suitable choices. A round-shaped fish with vibrant colors does not conform to the distinct flat shape and coloration typical of flounders. The reference to a long fish found in deep waters does not pertain to flounders, which are typically found in shallower coastal areas. Lastly, flounders are not known for their jumping ability, which is a common trait in other fish species, further clarifying why that choice is inaccurate.