Most fish do not sink in water because of the presence of May 10, 2015 11:39:46 GMT 5.5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Ganofins on May 10, 2015 11:39:46 GMT 5.5 swim bladderair bladderair sacsair in spongy bonesA. I and II are correctB. II and III are correctC. III and IV are correctD. I, II, III and IV are correct