What are the steps to using a triple beam balance

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.

How many atoms of nitrogen are in the chemical formula ni(w on