Yes, they are; although some jellyfishes have, inside them, mutualist symbiotic organisms which are producers.
bigger animals are the jellyfishes enemies.
jellyfishes eat plankton fish and even feed on other jellyfishes
35 people die by jellyfishes every year.
Yes, they are.
yes
No. They are invertebrates.
sea
yup
they sting worse than other jellyfishes also they are called box jellyfishes ?
# Pelagiidae, long jellyfishes like the common Pelagia noctiluca# Cyaneidae, the lion's mane jellyfishes# Ulmaridae, flat jellyfishes like the moon jelly# Tiburonidae, some aberrant abyssal forms
they are light
No, they haven't.