Final answer:
Whales have two adaptations in their eyes for living in a light-limited environment: the tapetum lucidum and a higher number of rod cells.
Step-by-step explanation:
Whales have a special adaptation in their eyes called the tapetum lucidum, which allows them to see in low-light conditions. The tapetum lucidum is a reflective layer behind the retina that helps to amplify and reflect incoming light. It is similar to the structure found in the eyes of cats and many other nocturnal animals.
Another adaptation whales have is a larger number of rod cells in their retinas compared to cone cells. Rod cells are more sensitive to light and can function better in low-light environments, while cone cells are responsible for color vision and work best in bright light.