a)
A – Ciil rackers act as a screen preventing entry of food and other particles that might damage the delicate gill lamella;
B – Gill bar for attachment of gill rakers and gill filament
C – Gill filaments – the surface on which gaseous exchange take place
b) Filaments are supplied wit a dense network of blood capillaries for the efficient transport of gases;
marto answered the question on October 4, 2019 at 10:44
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