The question is asking the determine the role that the United States do in the ecosystem base on the passage and situation in the question that you have state, base on my research, I would say that its role is a Dominant. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification
I believe the Answer is B but I could be wrong
Answer:
Substances with a pH less then 7 are acids. So they are 0-7
Explanation:
Hope this helps :)
