B is the answer?!? Sorry if im wront
The nervous system, i could be wrong.
If the conclusions do not support their hypothesis they would start the experiment all over again and see what they did wrong. <span />
Answer: Characteristics: The fins are supported by rays, as the name indicates. In contrast to the cartilaginous fish they have a rigid skeleton. The swim bladder is also a unique feature of most ray-finned fish, enabling them to maintain buoyancy as they move up or down in the water.
