Question ID:PT48 S4 Q12 Passage:Some species are called "indicator species" because the loss of a population of such a species serves as an early warning of problems arising from pollution. Environmentalists tracking the effects of pollution have increasingly paid heed to indicator species; yet environmentalists would be misguided if they attributed the loss of a population to pollution in all cases. Though declines in population often do signal environmental degradation, they are just as often a result of the natural evolution of an ecosystem. We must remember that, in nature, change is the status quo. Stem:Which one of the following most accurately expresses the argument's conclusion? Correct Answer Choice:BChoice A:Environmentalists sometimes overreact to the loss of a specific population. Choice B:The loss of a specific population should not always be interpreted as a sign of environmental degradation. Choice C:Environmentalists' use of indicator species in tracking the effects of pollution is often problematic. Choice D:The loss of a specific population is often the result of natural changes in an ecosystem and in such cases should not be resisted. Choice E:The loss of a specific population as a result of pollution is simply part of nature's status quo.