It would most likely be Bi-polar disorder. It has to be over a long periond of time. Say if she was in the hospital for a monthe she could be depressed for let's say three weeks before she was happy again for two weeks. that would be bi-polar.
Answer:
Principles
Explanation:
"Specificity and progression" are two principles related to maintaining physical health. Therefore we can say that the word "principles" is the most suitable to replace the word "thing".
Also, "Specificity and progression" are neither exercises nor muscles. Nor are they acronyms, since an acronym is the word formed by joining letters or initial syllables of a group of words, pronounced as one word.
