Standard atomic mass unit of carbon

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.

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Identify the electromagnets with poles that are reversed from the electromagnet shown above