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1. |
What were the isotopes used, to research about photosynthesis? |
A. | <sup>11</sup>C and <sup>32</sup>P |
B. | <sup>15</sup>C and <sup>35</sup>Cl |
C. | <sup>13</sup>C and <sup>14</sup>N |
D. | <sup>14</sup>C and <sup>18</sup>O |
Answer» E. | |