c. possessing a notochord.
d. the second embryonic opening becoming the mouth.
e. the coelom forming by outpocketing of the primitive gut.
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Question 3
Which of these parasitic worms is NOT a nematode?
Select one:
a. Ascaris
b. Trichinella
c. the worm that causes elephantiasis
d. hookworm
e. the worm that causes schistosomiasis
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Question 4
Which of the following organisms exhibit radial symmetry as adults?
Select one: