The answer would be sewer systems.
The dyes <span>changes</span> color because a chemical reaction has takes
place in the medium. When universal
indicator is added to a solution, the color changes which indicate the
approximate pH of the solution. It also means that there is a change in
the concentrations of an acid and a base.
This role would be the organisms niche. None of the other choices make any sense. A nesting site is not a role, a biomass is not a role, and territorial range is not the role an animal has in its community. A niche is an organisms role in its community, how it interacts with the things around it, where it lives and what it does.
The difference is that species that immigrate don’t hurt nothing around that environment but invasive species hurt things around the environment such as animals plants and other living things
