Among the flatworms,when a digestive tract is present,it has
A) a single opening, the mouth.
B) two openings, mouth and anus.
C) a single opening, the anus.
D) no external opening.
E) a nephridiopore opening.
Correct Answer:
Verified
Q11: Which of the following is not true
Q12: The flame cell system and protonephridia of
Q13: The _ layer of a fluke is
Q14: The free-living flatworms are classified in the
Q15: The free-swimming larval stage of some turbellarians
Q17: The osmoregulatory organs of turbellarians are called
A)contractile
Q18: Asexual reproduction by fission in some turbellarians
Q19: Among those turbellarians possessing a digestive cavity,digestion
Q20: Most turbellarian species
A)are marine scavengers.
B)are internal parasites
Q21: The lidlike hatch on a trematode egg
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