Why was keeping a continental army difficult under the articles of confederation, leading to changes in the u. s. constitution?
states with smaller populations did not want an army.
states with larger populations did not want an army.
congress had to raise a national military separate from the states.
congress could not force states to pay for troops' needs.

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?