Echinoderms are characterized by radial symmetry, several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right) radiating from a central body (= pentamerous). The body actually consists of five equal segments, each containing a duplicate set of various internal organs. They have no heart, brain, nor eyes, but some brittle stars seem to have light sensitive parts on their arms. Their mouth is situated on the underside and their anus on top (except feather stars, sea cucumbers and some urchins).
Echinoderms have tentacle-like structures called tube feet with suction pads situated at their extremities. These tube feet are hydraulically controlled by a remarkable vascular system. This system supplies water through canals of small muscular tubes to the tube feet (= ambulacral feet). As the tube feet press against a moving object, water is withdrawn from them, resulting in a suction effect. When water returns to the canals, suction is released. The resulting locomotion is generally very slow.
therefore, no. hydra supposedly had heart, brain and eyes and also do not have tentacles.
No, it's a Cnidarian
no, its a cnidaria
no
Brittle star
no, it is a vegetarian: D
It's an echinoderm whick primarily lives in ponds and lives off of other smaller organisms in the water such as brine shrimp and daphnia
A starfish is an echinoderm.
Echinoderm is an invertebrate and therfore it has no backbone
Yes sand dollar is an echinoderm.
No. A spider is an arachnid. A starfish is an example of an echinoderm.
an echinoderm is an organism with no spine
Because echinoderm means "spiny skin."
A bird is NOT an echinoderm because they dont live in salt water
Yes , a starfish is an echinoderm . It belongs to class Asteroidea . It is marine .
Hydra or Hydra