Because of the limited materials on the earth's surface, organisms have been competing for resources, polluting environments, and feeding on unprotected corpses and living bodies for over 3 billion years.
(organisms; have been competing; for resources) Context(organisms have been competing,List([57, 86))):(organisms; have been competing for resources polluting; environments)
organisms have been competing,List([57, 86))
organisms organisms
have been competing have been competing for resources polluting
for resources
environments