Please help me with biology

Which of the following represents a negatively charged ion? of t 7

What would be the most likely result if the ph of the stomach were increased to 5

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?