Depending on what species of jelly you are, turtles, mola mola, sea birds, and other jellies prey on jellyfishes.
Storms wash them up, climate changes can break or make cycles, marine debris can negatively contribute, but considering all that may, or may not be against them, jellyfish around the planet continue to thrive and in many cases are blooming faster than ever. There are many places that a major balance has taken hold, such as off Florida and the Gulf and others as well.
some because box jellyfish are really dangerous and if they sting you you can die right now or 1-2 days
Yes
First of all, the man-of-war is not a true jellyfish. Its body is filled with air. To be a jellyfish the "bag" of their body has to be filled with water. Also a box jellyfish is more dangerous. The box jellyfish is the most dangerous jellyfish in the world.
The box jellyfish is lethally dangerous if you have been stung over more than a few square centimeters of skin.
Their venom.
Clear
Most jellyfish are not dangerous. The Man o' War has the ability to do some painful damage to your skin, but it is not a true jellyfish . . .
Yes, both dangerous and friendly :-)
They can sting you and it hurts! Trust me, I know...
Some jellyfish stings are dangerous to humans.
A jellyfish has tentacles which can sting by injecting a toxin. Jellyfish can be extremely dangerous, despite being a very primitive type of organism with no skeletal system.
no that is just a color
IDK.Box jellyfish, Portuguese Man o war, Sea nettle, Earacounge (Ear-a-con-g). IDK the rest