So what caused some of the common ancestors to evolve into apes and others into humans? Random genetic mutations? The influence of external environmental influences? What are apes evolving into now? What are we?
Wow, that was redundantly repetitive.
If random mutations help them survive under external environmental influences and reproduce, those would be passed along more often.
What are apes evolving into now?
Who knows? Maybe nothing. Probably more species die out than evolve into something else. Others are quite well adapted and don't need to change. Sharks have been around for hundreds of millions of years. Check back in a million years and see.
What are we?
The great existential question. One for philosophy more than science.