1. regions, have
2. area, inhabited
3. monster, chases
4. Oregon, haunted
5. creature, hides
6. unknown thing, looks ( not sure on this one)
7. Bigfoot, avoiding
8. stories, tell
9. sightings, reported
10. no one, taken
an idea that recurs in or pervades a work of art or literature
Answer:
The river is very clean.
Explanation:
It indicates that the river is very clean since if you have fish and other invertebrates, you have to have some algae and water plants. If the river is dirty, little plants will grow and there won't be many fish and other invertebrates.
The answer would be Golden Gate Bridge. I hope this helps you.