Why is the C-14/C-12 ratio used to date once-living organisms? O A. The amount of C-12 changes when an organism dies.
O B. An organism stops taking in carbon when it dies.
C. The half-life of C-14 changes when an organism dies.
O D. C-12 becomes radioactive when an organism dies.

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?