What is the molar mass of hydrogen? ?

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.

The grooves or folds of the brain are called

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.