Atomic masses are usually expressed as averages due to the existence of what phenomenon?

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?