Answer:
Structural
Explanation:
Structural adaptations are a change to a organism's body, gills are part of the fish's body which would be why this is a structural adaptation!
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Mass over volume is the answer
A highly frequency sound wave corresponds to a high pitch sound
Answer:
Part a)

Part b)

Explanation:
Part a)
Moment of inertia of the core of the ball



now the moment of inertia for thin shell



now total inertia of the ball is given as


Part b)
Moment of inertia of uniform ball of mass 3.2 kg


