Rain forests and swamps are fragile ecosystems.
All the others are sentence fragments.
hope this helps
This is a scientific question, please post elsewhere.
I wouldn’t mind helping you out with this but i’ll need some extracts from the text itself. were you perhaps given some passages in particular to refer to as a class?
From the conditions of frontier life came intellectual traits of profound importance. The work of travelers along each frontier from colonial days onward describe certain common traits The result is that to the frontier the American intellect owes its striking characteristics. in the artistic but powerful to effect great ends; that restless, nervous energy; that dominant individualism, working for good and for evil, and withal that buoyancy and exuberance which comes with freedom
(Frederick Jackson Turner, “The Significance of the Frontier in American History,” The Frontier in American History (New York: Henry Holt and Company, 1920), 37.)
