  We consider polar perturbations of static Ellis-Bronnikov wormholes and
derive the coupled set of perturbation equations for the gravitational and the
scalar field. For massless wormholes the perturbations decouple, and we obtain
two identical master equations for the scalar and gravitational modes, which
moreover agree with the master equation for the axial modes. Consequently there
is isospectrality with threefold degenerate modes. For a finite mass of the
background wormhole solutions, the equations are coupled. We then obtain two
distinct branches of polar quasinormal modes for a given multipole number l,
associated with the presence of the two types of fields. We calculate the
quasi-normal mode frequencies and decay rates for the branches with l=2, 3 and
4. For a given l the real frequencies of the two branchesget the closer, the
higher the multipole number gets.
