Hello, my name is Greg.
There are some great resources that help detail the difference between open and closed. The basic is that closed systems are ones with very limited interactions between its parts or any outside groups while open systems interact with other systems or other places outside of their environment.
CLICK HERE for a resource that should help as you start to piece together your thoughts. After reading, reply back with any followup questions and I will be happy to further expand.
Once you are satisfied, please be sure to rate my response positively as that is the only way I receive any credit for my help today.