For lineage a, how many speciation and extinction events occurred from 2 million years ago to time 0?

I found the problem. 

Lineage a had 5 speciation events and 5 extinctions.

Speciation events are  events that splits the lineage and produce two or more separate species. 
Extinction events are events where the whole species die out in a short span of time. It is called "the great dying".

In the image,speciation is represented when one line breaks into two lines. Extinction is represented with the dagger symbol.

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