Birds that depended on green plants that needed sunlight would have quickly perished.
(green plants; needed; sunlight) (Birds that depended on green plants; would have quickly perished; ) Context(Birds that depended on green plants would have quickly perished,List([0, 84))):(Birds; depended; on green plants)
Birds that depended on green plants would have quickly perished,List([0, 84))
green plants Birds that depended on green plants Birds
needed would have quickly perished depended
sunlight
on green plants