<span>They built a system of bridges to cross over steeply sloped land.
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Answer:
The standard atomic weight is the average mass of an element in atomic mass units. Though individual atoms always have an integer number of atomic mass units, the atomic mass on the periodic table is stated as a decimal number because it is an average of the various isotopes of an element.
They gave us cheap work to help us build stuff
One way in which humans have modified the environment of Louisiana is by the building of levees.
<h3>How has humanity affected Louisiana's environment?</h3>
As a result of the constant flooding that hits Louisiana especially the deadly one that came with Hurricane Katrina, the government - both federal and state - have invested in the building of levees.
These levees are meant to channel floodwater away from populated areas and therefore protect Louisiana's population from flooding. They have however affected the way the environment of Louisiana looks.
Find out more on Levees at brainly.com/question/1104575
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