Assertion : A bony fish can stay at a particular depth without expending energy is a swimming contrary to the cartilaginous fishes.
Reason : In bony fishes, the swim bladder is present which helps in buoyancy.
A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both Assertion and Reason are true ,but the Reason is not the correct explanation of the Assertion.
C. If Assertion is true, but Reason is false
D. If both Assertion and Reason are false.
