Crossword Puzzle Whale WordsOnline version Complete this crossword using key words from the reading about whales. by Madian 1 Main food of the blue whale 2 Opening on top of the head for breathing. 3 Organs that whales use to breathe air. 4 Water vapor released when whales exhale. 5 The largest animals on Earth. 6 Filter-feeding structure found in some whales. 7 The scientific order to which whales belong. 8 Nutrient liquid produced by mammals for their young. 8 5 7 2 6