In the Galapagos Islands Darwin studied, amongst other animals, Chaffinches and he observed that they varied from one island to another depending on the specialisation that they needed at the time to get their necessary food intake.
(he; observed; that they varied from one island to another depending on the specialisation) Context(he observed,List([80, 91))):(they; varied; from one island to another depending on the specialisation) (the specialisation; needed; T:at the time; to get their necessary food intake) Context(the specialisation needed,List([149, 184))):(they; to get; their necessary food intake)
he observed,List([80, 91)) the specialisation needed,List([149, 184))
he they the specialisation they
observed varied needed to get
that they varied from one island to another depending on the specialisation
from one island to another depending on the specialisation
T:at the time to get their necessary food intake
their necessary food intake