Question: As a fish with a physoclistous swim bladder moves from shallower to deeper water, what must it do to maintain neutral buoyancy at the deeper

As a fish with a physoclistous swim bladder moves from shallower to deeper water, what must it do to maintain neutral buoyancy at the deeper depth?
It must remove gas from the swim bladder by burping
It must add gas to the swim bladder by gulping air
It must remove gas from the swim bladder via the muscular valve
It must add gas to the swim bladder via diffusion from the bloodstream
As a fish with a physoclistous swim bladder moves

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