42 or 43 is the number of how many total countries in the western hemisphere
Answer: wide spreads use of automoblies , growth of expressways
Explanation:
The answer to the question above is Bowen's reaction series. In geology, the reaction is work of a petrologist by the name of Norman L. Bowen. He explained why some minerals are found together and some others are not associated with one another.
It is true that new ecosystems have been created by human land use. When
humans use land, they change it to accommodate their own needs, and
thus new locations and new habitats for other organisms are created.
These organisms can now live there and create new organisms, and thus
create new ecosystems as a result of human use of that particular piece
of land.