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[A] : Sponges are primitive multicellula...

[A] : Sponges are primitive multicellular animals that probably evolved a multicellular structure independently of other animals .
[R] : Sponges are stationary animals and remain fixed to substratum while water passes over them .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
B
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