What is the purpose of a fish spine?

What is the lifespan of a VW transporters flywheel? What are x ray fish groups called? What minerals are in salmon? what gives a whale shark its yellowish skin? Are megalodon bigger than great white sharks? Is the shark in deep blue real? What is the longest living saltwater fish? Why are fish only able to breathe in water and not in air? Do glofish get along with a blackskirt tetra? What color are Elena fisher's eyes? Why the Hb count is more in male than female? If your marine toilet has a y valve you do no discharge zone? Are tiger sharks more deadlier then great white sharks? What type of sea pollution is killing the sea animals? Are discus fish hard to keep? What continent has more shark attacks? How many fry will a red wag platy give birth to? Do hammerheads eat other sharks? How fast did the first hydrofoil go? Is red bass a proudcer or consumer?