please help me with my biology 10 points?

[matthook38]

1. The type of symmetry found in all adult echinoderms is ____. (1 point)
horizontal
radial
bilateral
regional
2. A sea star can hold tightly to the surface it is touching because of the ____. (1 point)
sieve in the madreporite
endoskeleton
suction in the tube feet
eyespots
3. The long, spine-covered, tapered arms of sea stars are called _______. (1 point)


4. The sievelike, disc-shaped opening in an echinoderm’s body through which water enters and leaves is called the ______.