Question

the equation for photosynthesis is 6h₂o (water) + 6co₂ (carbon dioxide) + light energy → c₆h₁₂o₆ (glucose) + 6o₂ (oxygen). when first discovered, scientists were trying to decide if the oxygen in the product came from carbon dioxide or water. which statement describes how scientists traced the path of oxygen? they used a radioactive isotope and tracked it with a becquerel counter. they used a radioactive isotope and tracked it with a geiger counter. they used a stable isotope and tracked it with a becquerel counter. they used a stable isotope and tracked it with a geiger counter.

Explanation:

Scientists use radioactive isotopes to trace the path of atoms in chemical reactions. A Geiger counter is used to detect radioactive emissions. Stable isotopes do not emit radiation and cannot be detected by a Geiger - counter or Becquerel counter. A Becquerel counter is not typically used for this kind of tracing.

Answer:

They used a radioactive isotope and tracked it with a Geiger counter.