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a) Pectoral (fin) ;
Pelvic (fin);
ii) Dorsal (fin) ;
Ventral /anal (fin);
b) Muscles of mouth floor contract; mouth opens volume inside decreases and pressure in the mouth decreases; water rushes into mouth. Muscles of mouth floor relax and mouth closes;
Volume in mouth decreases and its pressure increases; water moves to part labelled T.
c) K - Long transverse process to provide large surface areas for muscle attachment;
L - Antagonistic muscles which contract and relax alternatively;
d) U - Scale;
W - Operculum/gill cover;
sharon kalunda answered the question on May 23, 2019 at 14:29
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