Name two animals which have no gills?

Explanation

In Lassaigne.s extract, sodium gets fused with halogen and form sodium halide.
`underset("(From compound)")(Na + X) overset("fusion")(rarr)underset("Sodium halide")(NaX)`
Silver nitrate test : The Lassaigne.s extract is boiled with dilute nitric acid. On cooling, a few drops of silver nitrate solution are added to it.
i) Detection of chlorine : If white precipitates formed and are soluble in ammonium hydroxide solution, then it indicates the presence of chlorine in the given organic compound.
`NaCl +AgNO_3 to underset("(Pale yellow ppt.)")(AgBr + NaNO_3)`
ii) Detection of bromine: If pale yellow precipitates formed and are partially soluble in ammonium hydroxide solution, then it indicates the presence of bromine in the given organic compound.
`NaBr + AgNO_3 to underset("(pale yellow ppt.)")(AgI + NaNO_3)`
iii) Detection of iodine: If yellow precipitates formed and are completely insoluble in ammonium hydroxide solution, then it indicates the presence of iodine in the given compound.
`NaI+ AgNO_3 to underset("(yellow ppt.)")(AgI + NaNO_3)`