How did the introduction of steamships affect transporting goods on rivers?

Why does sweden and norway have steep roofs

The map above shows where people live in the united states. areas that are darker blue are areas where people live close together. areas that are lighter colors are places where people live farther apart. as a geographer, if you were to study where people live and why they choose to live in these places, which of the six essential elements of geography would you be using?

Which anatomical feature would you expect to find in the fossil remains of a nocturnal species?