  Star clusters are formed in molecular clouds which are believed to be the
birth places of most stars. From recent observational data, Lada & Lada 2003
estimated that only 4% to 7% of the clusters embedded inside molecular clouds
have survived. An important mechanism for the disruption of embedded
(bound)-clusters is the dispersion of the parent cloud by UV radiation, stellar
winds and/or supernova explosions. In this work we study the effect of this
mechanism by N-body simulations. We find that most embedded-clusters survive
for more than 30 Myr even when different initial conditions of the cluster may
introduce some minor variations, but the general result is rather robust.
