Mostly water, about 60%

Mostly water, about 95%

Mostly jelly-like substance, about 95%

Mostly jelly-like substance, about 60%

They have no hearts, brains, or eyes. There is a set of nerves above their tentacles that give them basic senses.

They are one of the first animals with cephalization, meaning they have a cluster of nerves above their tentacles that act as a brain

They have no hearts or brains, only tentacles and a pair of eyes that see in the infrared spectrum of light

They have complex brains, nerves, and digestive systems, just like their close relatives squids

True: They're nearly identical

True: They're related and have similar anatomy but squid are more complex

False: They're in different phylums entirely and jellyfish are much less complex

Nemertea

Mollusca

Echinodermata

Cnidaria

Their tentacles paralyze their prey before dragging the prey into the mouth at the center of its body

They use their tentacles to constrict and suffocate their prey before dragging the prey into the mouth at the center of its body

Their tentacles paralyze their prey and break it down into mush that they drink with the sea water because they cannot chew

They use their sharp claws to attack their prey before dragging the prey into the mouth at the center of its body

Fish, shrimp, crabs and tiny plants because they'll eat anything they can

Fish, shrimp, and crabs because they're small enough to catch

Tiny plants, algae, and kelp because they're herbivores

Zooplankton because it is small enough to swallow without chewing

Cauliflower Jellyfish

Box Jellyfish

Portugese Man O War

Lion's Mane

No symmetry

Bilateral symmetry

Radial symmetry

Asymmetry

They use their tentacles to push them forward

They shoot water out of their mouths to propel them forward

They rely fully on ocean currents and otherwise float in place