1. List 5 things you have learned about arthropods. Complete sentences!!
Bellringer
List 5 things you have learned about arthropods.
Complete sentences!!

2. Sea stars, brittle stars, sea cucumbers, sand dollars, sea urchins….
Phylum Echinodermata
“Spiny Skin”
Sea stars, brittle stars, sea cucumbers, sand dollars, sea urchins….

3. General Characteristics
Adult—radial symmetry, larva—bilateral symmetry
Sexual reproduction and regeneration
Each arm has a digestive, reproductive, and nervous system (allows for regeneration)
Endoskeleton

4. Water vascular system
Allows them to eat, move, and exchange gases through hydraulics
Works by way of tubes (tube foot—hollow tube w/a suction cup end)
Water enters an opening on the dorsal side…sieve plate
Goes into the ring canal and radial canal in each arm

5. A muscular sac (Ampulla) helps to force water into the tube foot and then they lift
Like using a plunger