Having a little trouble with my homework. Any assistance would be greatly appreciated. Consider these three time periods:

1. The period of the earliest Americans

2. The period when major cultures first developed in North America

3. The period before Europeans arrived in the late 1400s

Select one of these periods and write a short paragraph explaining how the peoples in the Americas were affected by their environment at the time.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

food chain i would say only because there is competition on getting food and survival

by 1880, germany had more rail lines than great britain and russia.