What is the substance through which sound travels?

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.

Which lists the pairs of plates in order from least to greatest in terms of the work done to move the electron?

What was the first instrument to ever record an earthquake?