Yes; they can be.
Most jellyfish stings are not deadly, but stings of some species of the class Cubozoa and the Box jellyfish, such as the famous and especially toxic Irukandji jellyfish, can be deadly.
Humans have bones, jellyfish don't. Jellyfish are see through, humans aren't. Jellyfish will evaporate in the sun, humans won't. Jellyfish live under water, humans don't. Jellyfish have stinging tentacles, humans don't. Humans have different organs than jellyfish and allot more.
Australia. It's most-known for its deadly jellyfish.
yes they are really deadly to you and people
Something that deadly had to be a box jellyfish in my opinion.
No, not all.
most jellyfish stings can not but some such as the box jellfish can
All have the potential to be deadly. Some are more deadlier than others. Box and Man o' War jellyfish happen to be the worst.
There is no answer to this. Jellyfish, as do humans, come in all different shapes and sizes.
Cnidarians are jellyfish. They have a very simple body structure and nervous system, but some species, including the box jellyfish and the Irukandji, produce toxin that has been lethal to humans.
Yes, for example, Jellyfishes are Cnidarians.They could sting people.
i haven't heard of an "official" jellyfish of china but i do know that there are a lot of deadly box jellyfish that live off of china's coastline.