Mollusca and Echinodermata
sea urchin
squid
starfish
octopus
sand dollar
snail
How Echinoderms get their energy
Many echinoderms are carnvierous . Many echinoderms that are carniverous scavenge for food on the ocean bottom.
Most echinoderms that aren't carnivores, are filter feeders, who catch whatever particles are floating in the air.
Echinoderms reproduce sexually.
They have both male and female organisms 
which are hard to tell apart.



Echinoderms can also reproduce asexually,
by regenerating arms and legs and other body parts.
Echinoderms have radial symmetry.
When echinoderms are younger, and more mobile, they usually have a bilateral body plan.
Many echinoderms have spines, most of which are not pronounced .
phyla: echinodermata
4 main classes
Echinoidea: such as sandollars
stelleroidea: such as starfish
Holothuroidea: such as sea cucumbers
Crinoidea:such as feather stars
phyla name: mollusca
cost: £ 20 
reproduction
how they get food
body type
major classes/ types
scientific name: phylum mullusca
how do they help humans?
many mollusca members , have been used as food for many generations
molluscs such as bivalves have rare pearls inside hich are harvested by man to sell(which is why many of these bivalves are endangered)
not all molluscs are helpful to humans
one example is jellyfish who have stingers, and many other molluscs can either sting or bit, causing major pain or possible death
molluscs are characterized by a mantle and a large cavity, which is used for many things such as disposal of waste or breathing.
~aplacophora
~polyplacophora
~monoplacophora
~gastropoda
~cephalopoda
~bivalvia
~scaphopoda
~many molluscs reproduce sexually
~ and a large muscular foot, used for movement
many molluscs are filter feeders, and if they aren't then the molluscs are carnivores, they move through the ocean in serach of food