2. Explain what an isotope is and give two important physical properties of isotopes that make them useful in biological research. Define half-life.

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.

In saturated organic compounds, all the bonds between carbon atoms are called?

What term describes technology that operates on an atomic level