Writing Homework Help

I’m working on a computer science question and need guidance to help me learn.

Answer the below questions: 

Q) Why is one of the largest disadvantages of targeting a lower OS version the lack of features from future versions? 

Q) When it comes to devices, why are screen resolutions often one of the most frustrating issues in regards to mobile app development? 

Q) Why are apps aimed at state government or education great fits for BlackBerry mobile apps?