Question

rays swim near the sea floor. a rays mouth is under its body. this helps the ray catch food. rays eat small sea animals that live at the bottom of the sea. complete the sentence. rays on the sea floor. catch food swim faster change color

Explanation:

The text states that rays swim near the sea floor and their mouth being under the body helps catch food. The question is about what rays do on the sea floor. The options are "catch food", "swim faster", "change color". Since the text mentions the adaptation (mouth under body) helps catch food (related to sea - floor activity as they eat bottom - dwelling animals), "catch food" is the correct choice.

Answer:

catch food