They belong to the phylum: Marine animals.
Have radial symmetry, a mesodermal skeleton and they all have a water vascular system called: ambulacral.
No.
Yes Eventually echinoderms do live in water.
No not all Echinoderms have backbones like the starfish
Echinoderms live only in the sea.
Yes, all echinoderms have radial symmetry.
Echinoderms have all the same organs as are normally found concentrated in the head only they have them scattered. So what if their eyes are on their legs if they still see. It is the seeing that is important, not the location of the eyes.
no, a lobster is a crustacean, not an echinoderm
Some do but not all.
Sea urchins and sand dollars.
echinoderms
Not all echinoderms have eye spots. While many echinoderms, such as starfish and some sea cucumbers, possess simple light-sensitive structures called eye spots, others do not. The presence and complexity of these eye spots can vary widely among different echinoderm species, reflecting their diverse adaptations to marine environments. Overall, eye spots are not a universal feature across all echinoderms.
Echinoderms are in the Animalia kingdom.