Function of semilunar valves in the heart​

There are six elements that make up most of the human body. which of the following is not one of these six elements?

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Which component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale