Evolutionary tree is pictorial and
schematic of
evolutionary relations species of
living in which the (or a
preceding ) represents common
ascendants species and groups
living beings that distributed along
its according to hypothesis
their origin. For , today it is
that birds and are
two distinct of the same
reptile branch.

Biology assures a definite
tree (phylogeny) on
species of living that live or
lived in our . There are many
to be discovered many knowledge
gaps be filled. One the most
promising to study phylogeny
the comparison of molecules
from different of living beings
similarities and differences
nucleotide sequences that
indicate more or relatedness among
species.