Link between different activities

[Saptarshi_Konar]

I have data for the following activities-

• Send Email
• Email Delivered
• Email Bounced
• Unsubscribe Email
• Open Email
• Click Email

I want to know what is the common attribute between these activities through which I can identify that the email which had been send to lead, was opened or clicked later. 

[SanfordWhiteman]

You need to ask yourself how you'd tie these together in the Marketo UI. It's not easier in the API dump!

[Saptarshi_Konar]

I did not get you, My Question is if I have data for "email send" and "email delivered"(from bulk extract API), how would I map this data between this two activities.

Is it the "primaryAttribute" by which we can connect the activity?

And one more thing, is there any document to get details/ meaning of each activity and there respective attributes.