Read the passage and then answer the following questions:Researchers suggest that there are creatures that do not know what light means at the bottom of the sea. They don't have either eyes or ears; they can only feel. There is no day or night for them. There are no winters, no summers, no sun, no moon and no stars. It is as if a child spent its life in darkness in bed, with nothing to see or hear. How differents our own life is! Sight shows us the ground beneath our feet and the heavens above us the sun, moon and stars, shooting stars, lighting and the sunset. It shows us day and night. We are able to hear voices, the sound of the sea, and music. We feel, we taste, we smell. How fortunate we are!We discover that the sea creatures in the passage ____.