  We study solutions of the Friedmann equations in case of the homogeneous
isotropic Universe filled with a perfect fluid. The main points concern the
monotony properties of the solutions, the possibility to extend the solutions
on all times and occurrence of singularities. We present a qualitative
classification of all possible solutions in case of the general smooth
barotropic equation of state of the fluid, provided the speed of sound is
finite. The list of possible scenarios includes analogs of the "Big Rip" in the
future and/or in the past as well as singularity free solutions and oscillating
Universes. Extensions of the results to the multicomponent fluids are
discussed.
