Depends on what you are trying to test.
See if any of the organisms lived before the others by measuring the age
of their fossils using some means, like radioactive dating.
ATP supplies the energy to produce glucose and other carbohydrates. In the chemical equation for photosynthesis, carbon dioxide and water are converted to glucose and oxygen.
The answer is C. decreases.
C-14 and C-12 are carbon isotopes used to measure the approximate age of organic remains. C-12 is stable, and it does not break down into other elements over time. C-14 is not stable. It breaks down into N-14.
Organisms can incorporate C-14 into their bodies during the life. But when the die, C-14 is not incorporated anymore. After organisms' death, C-12 will remain stable, but C-14 will start to breaks down into N-14. So, it will be less C-14 and C-12 will remain the same. The ratio of C-14 to C-12 must decrease over time.
