Which heading best completed the partial outline below? 1.
(heading)
• Development of the telegraph
• Northern textile mills buy Southern cotton
• Settlement patterns move from rural to urban
• An increase of immigrants to American cities
Development of industry in the North
Development of industry in the South
Development of agriculture in the North
Development of agriculture in the South

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?