Answer:
Plant cells have a cell wall and a cell membrane.
In plants, the cell wall surrounds the cell membrane.
Animal cells have a cell membrane but no cell wall.
Plant cells have cytoplasm.
Both have a nucleus.
Which activities? I want to say the nucleus as it is the control center of the cell, but this is a vague question.
Tge system that coirdinate and send message to the body is the nervous system
Serotonin reuptake inhibitors, they are antidepressants.