As the earliest living organisms evolved from single cells to more complex forms, they developed circulatory systems to supply oxygen and other vital nutrients to their multicelled bodies.
(the earliest living organisms; evolved; from single cells; to more complex forms) (they; developed; circulatory systems) Context(they developed,List([82, 96))):(they; developed circulatory systems to supply; oxygen and other vital nutrients; to their multicelled bodies)
they developed,List([82, 96))
the earliest living organisms they they
evolved developed developed circulatory systems to supply
from single cells to more complex forms
circulatory systems
oxygen and other vital nutrients to their multicelled bodies