  We analyze traversable wormholes defined by the dynamic line elements that
asymptotically approaches Friedmann-Robertson-Walker (FRW) universe. This
dynamical wormholes is supported by the galactic dark matter as well as perfect
isotropic fluid. We will discuss several evolving Lorentzian wormholes
comprising with different perfect isotropic fluids in addition to various scale
factors. We will speculate the various significance, features and throat energy
conditions for these evolving traversable Lorentzian wormholes.
