The answer would be C, I hope I helped ! :)
Answer:
An event surprised the scientific world
Explanation:
I
Yeah it is possible to do that.
Yes, or at least I do, whats the problem?
Physical barriers are natural barriers, such as mountain ranges, rivers and other bodies of water, and even deserts.
On the other hand, human barriers are the barriers of countries and of states, which are not always dictated by natural barriers.