Why was mainstream society troubled by the influx of new immigrants in the 1880s? they feared that immigrants would try to assimilate into american society. they worried that they would not be able to do their jobs as well anymore. they feared that the government would give immigrants equal rights. they felt that too many immigrants would take up land in the west. they worried that the new immigrants could not be assimilated?

Some organisms have a large geographic range. for example, the norway rat lives on every continent except antarctica. a population of norway rats is the number of rats in one particular area. do you think it’s scientifically possible for a population of norway rats in north america to carry different genetic mutations than a population of norway rats in africa? do you think it’s possible that they carry some of the same mutations? what types of information can scientists learn by studying the genomes of these two populations of rats?