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Regarding complexity of the circulatory system in animals: 1. open type - blood is pumped out of the heart and the cells and tissues are directly bathed in it 2. closed type - blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).

( a ) Both are incorrect
( b ) 1 is incorrect but 2 is correct
( c ) 1 is correct but 2 is incorrect
( d ) Both are correct
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(D) is the right answer.

Similarly, the circulatory system may be of two types: (i) open type in which the blood is pumped out of the heart and the cells and tissues are directly bathed in it and (ii) closed type in which the blood is circulated through a series of vessels of varying diameters (arteries, veins and capillaries).
answered Jan 3, 2014 by pady_1
 

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