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Around the mouth of a sea star is a circle of nerve fibers called a ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
Echinoderms contain a (n) ___ similar to the kind that vertebrates have.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
Echoinderm larvae have ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
Echinoderms live ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
The plate on the top of a sea star through which water enters the vascular system is called the ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
The tiny suckers on a sea star's arms that help it to move and capture food are called ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
An ampulla regulates ___.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
Name the four major groups of echinoderms.
endoskeleton
sea stars, brittle stars, sand dollars, sea cucumber
bilateral symmetry
water pressure in a tube foot
tube feet
in salt water
sieve plate
nerve ring
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