Seems so- but as indicators of a problem, not as a problem per se. See
http://www.enn.com/wildlife/article/40035
Yes. An invertebrate is an animal without a spinal column. Jellyfish do not have spinal columns, or any skeleton of any kind.
Jellyfish do not have any bones.
No. The box jellyfish has a stronger poison than any other jellyfish.
Jellyfish do not have any sort of skeleton.
No.
no
Jellyfish float randomly in the ocean, so any kind of jellyfish can be anywhere
yes, I am pretty sure that there are poisonous jellyfish in the Bahamas.
Jellyfish do not have muscles or bones in their uniquely designed bodies.
no
Jellyfish don't experience any fear because they haven't got a brain.
Jellyfish are composed of cells just like any other organism is.