choice: respiration animal
choice: respiration food
choice: respiration breathing
choice: respiration living
choice: respiration vigorous
choice: food living
choice: respiration oxygen
choice: respiration carbon dioxide
choice: animal food
choice: animal breathing
choice: animal living
choice: animal vigorous
choice: animal oxygen
choice: animal carbon dioxide
choice: food breathing
choice: food vigorous
choice: food oxygen
choice: food carbon dioxide
choice: breathing living
choice: breathing vigorous
choice: breathing oxygen
choice: breathing carbon dioxide
choice: living vigorous
choice: living oxygen
choice: living carbon dioxide
choice: vigorous oxygen
choice: vigorous carbon dioxide
choice: oxygen carbon dioxide