Role of plants in the so-called "circle of life" o Food producers
o secondary food producers
o Secondary food consumers

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

How many neutrons does a atom of cobalt have?

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.