Multiple Choice
The orientation of a sea star is
A) a dorsal mouth and a ventral spiny surface facing upward.
B) an oral mouth facing downward and an aboral spiny surface.
C) an anterior mouth and a posterior spiny surface.
D) a dorsal oral mouth and a ventral-aboral spiny surface.
E) a ventral mouth and an anti-ventral spiny surface.
Correct Answer:

Verified
Correct Answer:
Verified
Q50: Arrow worm anatomy<br>A)lacks any coelom.<br>B)lacks a complete
Q51: A calcareous sieve leading to the water
Q52: Minute,pincer-like _ are found on the surfaces
Q53: Treating sea urchin eggs with hypertonic seawater
Q54: Water for filter feeding in the hemichordates
Q56: The calcareous plates found underneath the epidermis
Q57: The grooves that run along the oral
Q58: Unique characteristics of echinoderms include all of
Q59: The complex chewing apparatus found in many
Q60: The Chaetognaths<br>A)have radial symmetry.<br>B)feed on clams.<br>C)are small