Answer:
Moreover, Besides, Also, Furthermore.
Explanation:
All of these words above express addition, you can add more information after them, the one you used is more suitable to show contrast between two different things. The two uses that you mentioned are both good, so <em>on the other hand </em>is not the correct option here, if you use <em>on the other hand</em> what comes next should be a <u>negative effec</u>t of the use of medical marijuana.
Answers:
1. the word that joins the two parts is "and"
2. the subject is "they"
Explanation:
1. the words joining compound sentences can be easily remembered using the acronym 'fanboys': for, and, nor, but, or, yet, so
2. the subject of a sentence is the person/thing that is doing or being something
i hope this helps! :D
The third and fourth from the top,