Section: Reading

13) View Additional Information

The passage indicates that many underwater animals cannot see because:

1. the lack of light has gradually eliminated their capacity to see.
2. they use sound waves instead of light to navigate in the darkness.
3. they have learned to survive without seeing their enemies or their prey.
4. their sense of touch has eliminated thier need to see.

Lines 1 and 3 state that many of the animals have gradually become blind because they exist in a world of complete darkness.