Can someone help me with this thanks.

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Strong conductivity of plasma allows it to act and react as and