Think of it this way. In sea star development, the last stage is the late gastrula, as development continues, two pouches (the coelomis sacs) form by outpocketing from the endoderm surrounding the gut. These pouches become part of the coelom (body cavity), and the walls of the lateral pouches become the third germ layer, the mesoderm.
I got this information from my college lab manual, Inquiry Into Life, Thirteenth Edition
No, starfish are marine echinoderms with five or more radiating arms.
Yes they are. They have a body cavity within the central disk. Don't fully rely on this. this was interpreted from general findings from an AP Bio book.
Yes.
No.
Coelomates.
coelomates
Most animals are coelomates, including humans.
Includes: Sea Stars, Sea Lillies, Sea Urchins, Sea Cucumbers, Brittle Stars
sea stars have NO brains
sea stars are flexible. sea stars do not have any bones. so they are very flexible:)
Sea stars are not fish so no, it is not.
Sea stars, brittle stars, sea urchins, and sea cucumbers.
Baby sea stars are larva.
Yes. Sea stars are carnivores that eat can eat other sea stars and shrimp and other crustations like crabs. Over a long period of time sea stars move across the ocean floor. Giant sea stars will sometimes specifically prey on other, smaller sea stars. they eat poop
Yes, earthworms are coelomates because they have the "tube within a tube" body plan that characterises coelomates. More specifically, coelomates have a body cavity that is completely lined with cells derrived from the mesoderm (the germ layer of tissue found between the endoderm and ectoderm in embryonic development).
coelomates