Contents
If behavior is meaningful and expedient actions for which a person is responsible as their author, then activity is behavior that produces something socially significant, creates something significant for people.
Common
Both behavior and activity are meaningful and expedient (purposeful) actions of varying degrees of awareness. The activity seems to be more conscious.
Differences.
The author is important in behavior.
Guilty — answer for your behavior. Deserved — get a reward for your behavior. I got it myself — yours.
In activity, it is important what is created as a result.
“What are you producing? What are you a manufacturer of?