Basic Facts
Jellyfish are what type of invertebrate?
marine
What is the main body of a jellyfish called?
Bell
Jellyfish are what type of eater?
Carnivore
Some jellyfish can glow. What is this called?
Bioluminescence
What animal commonly eats jellyfish?
sea turtles
Jellyfish belong to what phylum?
Cnidaria
What hangs from the bell to catch prey?
Tentacles
How do jellyfish move?
contracting and pulsing
Jellyfish are about what percent water?
95%
Small fish hide in jellyfish tentacles for what?
Protection
Jellyfish have existed for over how many million years?
500 million
What are the stinging cells called?
Nematocysts
How does oxygen enter their body?
diffusion
What type of symmetry do jellyfish have?
Radial Symmetry
Jellyfish compete with what animals for plankton?
Fish
Jellyfish are found where?
Every ocean
What is the digestion chamber called?
Gastrovascular cavity
Name one organ jellyfish do NOT have.
brain
What earlier life stage can some jellyfish return to?
Polyp Stage
What are large groups of jellyfish called?
Blooms
Jellyfish lived before what extinct animals?
Dinosaurs
What simple nervous system replaces a brain?
nerve net
Jellyfish can reproduce in what two ways?
sexually and asexually
Why does being mostly water help jellyfish survive?
Makes them flexible / helps them float / camouflage
Why can jellyfish blooms affect fishing industries?
They compete for food / clog nets / reduce fish populations