Please enable JavaScript.
Coggle requires JavaScript to display documents.
echinoderms (Movement Maha al hamlan (Movable bony plates, The structure…
echinoderms
-
-Sea stars prey on a variety of mollusks , coral, and other invertebrates.
-
- then they spread digestive enzymes over the food.
-
respiration , circulation and execration :
Areeb Altashlan
-
-
respiration
use tube feet
( 1. oxygen diffuses from the water through the thin membranes of the tube feet.
- skin gills
- many sea cucumbers have branched tubes, called respiratory tree )
-
-
Sea lilies and feather stars extend their arms and trap food. 
-