OB GYN Nurse Practitioner vs. OB GYN Doctor

Hello,

I had a few questions concerning OB GYN Nurse Practitioners and OB GYN doctors. If you are able to answer a few of them, if not all, I would greatly appreciate it!

1. What are some of the differences in responsibilities between the two careers of OB GYN Nurse Practitioner and Dr.? What are some reasons someone would choose to pursue one over the other?

2. When searching for a bachelor's degree in nursing, how do I know whether the school in question is accredited by a good institution? What are some examples of good accreditation qualifications?

3. Is it possible to get a bachelor's degree in ultrasound and then pursue medical school to become an OB GYN Dr.? What are some other ways someone might become an OB GYN doctor?

Thanks in advance for your time and sharing of knowledge.