How does sharks protect themselves?

Question

add please the jellyfish,octopus,polar bear,camel,chameleon and butterfly

Answer 1

Speed.  But they are at the top of the food chain so nothing preys on them except man.  

Answer 2

in the last few seconds before the white shark attacks a seal he is practically blind because it rolls his eyes back to prevent injury..eyes are their most vulnerable body part..

that's the first thing that came into my mind  

Answer 3

how do, first of all.

they swim away from danger.

the rest - why so many questions at once? seems like this isn't curiosity, but an assignment. There are too many ways for one answer - camouflage, running away, kicking, poison, etc. - but which one is used by which animal, you will have to do some work on.