The tentacles of the jellyfish ar dangerous not its body, but overall yes it is a dangerous sea creature, some jellyfish have tentacles as longas 10 to 9 feet and are not visible to humans naturally. The tentacles when on contact with skin leave small posion that makes the person suffocate and causes their body to go through immnense amount of pain!( i will be corrected on the effects of the sting so please do not refer to the effects that i have said as the accurate ones ) some jellyfish are transparent and are hard to see, the only dangerous part in a jellyfish are the tentacles which suck!
Crystal Jellyfish mainly feed on humans, whales and another large mammals in the ocean. The Crystal Jellyfish is one of if not the most dangerous organism in the ocean. they can kill a whale within 43 seconds. They are found throughout the entire world which makes them even more dangerous.
Yes
it has poison in its stingers that might kill you.
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.
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 . . .
It's a type of jellyfish so that makes it an invertabrate.
Well it's gotta be both cuz the box jellyfish as a POISONUS venom and the mosquito carries parisites and disease. So it's both
Yes, both dangerous and friendly :-)
They can sting you and it hurts! Trust me, I know...