Which of the follwoing statement(s) is/are correct? (i) Organ systems in different group of animals show various patterns of complexities. (ii) The digestive system in platyhelminthes has only a single opening to the outside of the body that serve as both mouth and anus, and is hence called complete. (iii) In open type of circulatory system, the blood is pumped out of the heart and the cells and tissues are directly bathed in it. (iv) In closed type, the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).
A. Only (i)
B. Both (ii) and (iii)
C. (i), (iii) and (iv)
D. All of these
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Correct Answer : C.
The digestive system of platyhelminthes is incomplete. A complete digestive system has two openings, mouth and anus.