Yelling fire in a theatre when there is no fire presents which of the following? warning dilemma clear and present danger fighting word need this asap

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

Which of the following types of stars had the smallest initial mass? which of the following types of stars had the smallest initial mass?

Which part of the muscular and skeletal system work together to move muscles and bones?