1) Sharks are... a) mammals b) reptiles c) fish 2) How many species of sharks are there? a) more than five thousand species b) more than five hundred species c) more than fifteen hundred species 3) How many years have sharks existed? a) 420 million years b) 450 million years c) 430 million years 4) What is the name of the bulge on sharks' backs? a) Dorsal fin b) Caudal Fin c) Pectoral Fin 5) What is the use of the dorsal fin? a) To give propulsion b) To keep balance c) To give them support 6) What is the use of the caudal fin in fish? a) To keep balance b) To give them support c) To give propulsion 7) What do sharks use their pectoral fins for? a) To give them propulsion b) To give them support c) To keep balance 8) What do sharks use their noses for? a) To breathe and smell b) To breathe c) To smell 9) How sharks breathe? a) They use their lungs to take oxygen from the air b) They use their gills to take oxygen from the water they collect with their mouths c) They use their lungs to take oxygen from from the water they collect with their mouths 10) Why sharks are lighter? a) Because they don´t have bones, they have cartilages b) Because they don´t have cartilages, they have bones  c) Because they are invertebrates 11) Nowadays the biggest fish in the ocean is... a) The White shark b) The Megalodon shark c) The Whale shark 12) The whale shark can be up to a) 12m long b) 20m long c) 25m long

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