posted by Mack .
[I choose b.]
Where are some of the unique ecosystems of the U.S?
a.in Pacific Northwest and California
b.in the Flordia Everglades and Hawaii
c.both (a) and (b)
d.none of the above
The U.S. has many unique ecosystems. Please think through the question again and post a different answer.
It's both a and b.