Its a riddle see if you know it?

[seth v]

its the begining of the end its the end of time
its the begining of eternity its the end of the universe
its the begining of earth but the end of the human race
what is it?

 

[Alysha K]

E thats a good one

 

[kankoa]

e
My grandpa told me that when i was 5