(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.


32 Assertion: mollusca test aquatic having an organ system level of
organisation
Reason:day aur the largest phylum which includes insects.

Dear student,

​​The question seems to be incomplete or maybe have typing errors. Making certain assumptions have given the answer bellow:
The correct answer is (c) A is true but R is false.
Mollusca have organ systems level organization. They are aquatic organisms with bilaterally symmetrical, triploblastic and coelomate body. 
But the largest phylum including insects is Arthropoda.

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