Your lungs. The lungs control your ph balance by releasing carbon dioxide
Answer:
but you have not shown us the pictures..
Its probably personal beliefs or peers. because if your religion doesn't allow you to have sex until a certain age or until your married then that can get in the way. but peers pressure friends/people into doing things they aren't ready for
The answer would be enzyme because vitamin D is a protein enzyme
I'm pretty sure it's letter A or C
