How do reptiles breathe?

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?

As a small change in a person's dna can cause a genetic disorder

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity