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In Mollusca : 1. A soft and spongy layer of skin forms a mantle over the calcarious hump. 2. The space between the hump and the mantle is called the mantle cavity 3. In mantle cavityfeather like gills are present. Regarding 1,2 and 3:

( a ) 3 is incorrect; 1 and 2 are correct
( b ) 1 is correct but 2 and 3 are incorrect
( c ) 1 is incorrect but 2 and 3 are correct
( d ) 2 is incorrect but 1 and 3 are correct
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(C) is the right answer.

In Mollusca : A soft and spongy layer of skin forms a mantle over the visceral hump. The space between the hump and the mantle is called the mantle cavity in which feather like gills are present.
answered Mar 20, 2014 by pady_1
 

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