Darwin hypothesized that varieties of a species which were best adapted to their environment were responsible for the gradual evolution of the species.
(a species; were; best adapted to their environment) (a species; best adapted; to their environment) (Darwin; hypothesized; that varieties of a species which were best adapted to their environment were responsible for the gradual evolution of the species) Context(Darwin hypothesized,List([0, 19))):(varieties of a species; were; responsible for the gradual evolution of the species)
Darwin hypothesized,List([0, 19))
a species a species Darwin varieties of a species
were best adapted hypothesized were
best adapted to their environment
to their environment
that varieties of a species which were best adapted to their environment were responsible for the gradual evolution of the species
responsible for the gradual evolution of the species