Which special features help fishes to sense their environment ?
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Fishes have following sense organs to sense their
external environment.
(i) Ear is formed of only one internal ear having three
semicircular canals.
(ii) Olfactory sacs (nasal chambers) do not open in buccal
cavity as internal nares are absent.
(iii) Lateral line sensory system is present to note the
changes in surrounding water.