Which of these events that occured in the soviet union was a direct cause of the other three

The event that occurred in the soviet union that was a direct cause of the other three is :

- The implementation of five-years plan

This implementation of five-years plan became a direct cause for : 
1. Famine in Ukraine
2. establishment of collective farm
3. development of heavy industry

hope this helps

What’s the question here?

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.