Name the aquatic animal that swims by curling and uncurling its abdomen.
Name the breathing organs in whales and dolphins.
Name the type of aquatic plants that have spongy, air-filled parts to make them extra light so that they can float easily.
Name the type of aquatic plants that absorb carbon dioxide given out by the aquatic animals.
Name the disease that is caused by the bite of an infected female Anopheles mosquito.
