[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.

a?

It's both a and b.

That's correct! Some of the unique ecosystems in the U.S. are found in both the Pacific Northwest and California (option a) as well as in the Florida Everglades and Hawaii (option b). These regions have distinct environmental characteristics and support a wide variety of plant and animal life. Exploring these diverse ecosystems is a great way to learn about the incredible natural diversity of the United States.