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.


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