Ascientist plans to find out if dams harm a river ecosystem. he interviews 500 environmentalists and 450 of them believe that dams are harmful for the ecosystem. the scientist concludes that 90 percent of people believe that dams are harmful. why is the scientist's conclusion most likely unreliable? very few people were interviewed the source of information could be biased the data about river ecosystems is not accurate the results of the investigation cannot be repeated