unit 4

1. leader, manager, supervisor
4. the purpose or role of something, the way something works or operates
7. the act or process of changing physical location or position, or the act of moving parts of the body
11. organ in the head that controls the body's functions and enables thinking, learning, and memory
12. term over a brief period of time, lasting or existing for only a short period
13. to change or alter, to be different
15. the degree of hotness or coldness of a body or environment

2. important, meaningful, noteworthy
3. term over a lengthy period of time, extending over a long period of time
4. instance as an example
5. to manage or direct something, to have power over something
6. the ability to create mental images or concepts that are not present in reality
7. important, significant, primary
8. a bundle of fibers that can contract and produce movement in the body
9. a range of different things
10. to separate into parts or sections, to distribute or share
14. the ability to retain and recall information and experiences