Can anyone help me understand Circular Economy? for science

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.

If steel is more dense that lake water, why can a boat float

Which one of the following research methods can show cause and effect