In Spanish, question marks are used twice in a sentence -at the blank
of the question.

Once in the beginning, as an upside-down one (¿) and once and the end. (?)

Please mark me Brainliest, I need it to move onto the next level.

they need to keep water moving over their gills so they seem to have active periods and restful periods instead of undergoing deep  sleep.  they sleep swim

explanation: