a)
A – Gill filament
B – Gill bar
b)Traps solid particles in water which would otherwise pass over the surfaces of gill filaments and damage them mechanically / physically.
c)
(a) Moistened to facilitate diffusion of gases in solution form.
(b) Large and extensive to provide a large surface area for gaseous exchange.
marto answered the question on September 30, 2019 at 09:44
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