  We incorporate the generic hierarchical architecture of foodwebs into a "{\it
unified}" model that describes both "micro" and "macro" evolutions within a
single theoretical framework. This model describes the "micro" -evolution in
detail by accounting for the birth, ageing and natural death of individual
organisms as well as prey-predator interactions on a hierarchical dynamic food
web. It also provides a natural description of random mutations and
speciation/orgination of species as well as their extinctions. The distribution
of lifetimes of species follows an approximate power law only over a limited
regime.
