Filter feeders- water moves through and food is extracted from water
Respire by exchanging of gases from cell to cell
Do not have response
no nerve cell
mature sponge do not move
Food: Jellyfish feed on small plankton type animals that they capture within their tentacles, which have stinging cells, called nematocysts.
Life cycle of a jellyfish:
-Adult jellyfish sexually produce eggs and sperm and the larvae is, either 'brooded' within the gut of the adult or develops as a free swimming planula.
-The planula settles onto a substrate, the hydratuba stage, and develops into an adult, or scyphistoma.
-The scyphistoma, which is a sessile or stationary polyp, asexually buds off a small medusa which develops into an adult
Brian/Nerv system: instead of a brain, "true" jellyfish possess an elementary nervous system, or nerve net, which consists of receptors capable of detecting light, odor and other stimuli and coordinating appropriate responses.
Movement: with body parts radiating from a central axis. This symmetry allows jellyfish to respond to food or danger from any direction