Define open system. a. a group of unconnected things that work together to form a complex whole
b. a group of things that do not work together to form a complex whole
c. a system that maintains itself on a limited amount of resources
d. a system that receives input from and gives output to an outside environment

Short answer/constructed response: respond to the question in 3-5 complete sentences. give details or examples to support your answer. attempt to answer all parts of the question in paragraph form! using the source 1 map, pick two of the 1800's territorial acquisitions you believe were the most important in the development of the united states. provide at least two reasons per territory to explain why you think they were the most important.