47. Why does the oxygen isotopic composition in the ice cores provide a good record of the climate? (A) is a more powerful greenhouse gas than . (B) The -water dissolves a little more CO2 than -water. (C) The half-life of radioactive is a function of temperature. (D) The more intense the sun's nuclear fusion reaction, the more will be produced. (E) There are slight differences in the evaporation and condensation of .