Why is the process of protein synthesis critical to life?

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?

Which structure in the cardiovascular system connect arteries to veins?

What is the one part of the nucleotide  that differs among the other different nucle  tides?