Explain how stem changing ir verbs are differnet from stem changing ar and er verbs in the present subjunctive?

Nunca te voy a decir que te amo- im never going to say that i love you. no hay nadie aqui- there is no one here

1. chiriquí a province that shares an indigenous culture with colombia. 2. san blas the largest population of indigenous people in panama. 3. bocas del toro in this province, the women make brightly-colored, embroidered blouses. 4. panama province home to three different groups of indigenous people in panama. 5. darien has less of an indigenous population than most other provinces in panama. 

Ok i want u to explain this wth is that

A. biphenyl ethylene