Why is edge2020 so messed up

What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

Secondary school falls between a . kindergarten & elementary b. elementary school & post secondary school c. post secondary school & higher education d. middle school & high school

Why are radio observatories located in valleys far away from urban centers? a. to shield them from electromagnetic interference b. to avoid sound pollution c. to avoid disturbing people living in the city d. to shield them from water vapor