The process by which a population becomes better suited to its environment is known as ?

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?

Ineed to know why d is the correct answer asap

What best describes the structure of the declaration of independence?