Plant cells are also able to become longer as they grow. ... Cell elongation does not occur in animals. The cells of multicellular animals and plants must also differentiate , so that its cells develop features that enable them to fulfil specific roles. Cells that have differentiated have become specialised.

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.