nuclear fusion is the source which creates photons and heat. hydrogen is changed to helium thus heat and light are dispensed.
i think the answer is index fossils. index fossils tell the relative age of rocks, and fossils of organisms that were widely distributed but only lived during a shorter period of time are called index fossils. hope this : )
answer: 4.86 x 10⁻³ mole.
explanation:the number of moles can be calculated using the relation; n = mass / molar mass.n is the number of moles, mass is the mass of the substance in g (m = 0.5 g), and molar mass of nabr = 102.894 g/mole.n = mass / molar mass = (0.5 g) / (102.894 g/mole) = 4.86 x 10⁻³ mole.