The data table below shows a person’s heart rate measured in beats per minute (bpm) at five different times in the beginning of a day. What causes the change in heart rate over time? 1. tired
2. increased activity
3. passing of time
4. forgetting to eat

The rules of engagement (roe) working group is often used to (select all that apply.)

Acontrol during an experiment. might change remains constant does not exist does change

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.