Final answer:
It is plausible that carbon from Albert Einstein's exhaled CO2 could be in the glucose of your cereal, as carbon atoms recycle through the carbon cycle involving cellular respiration and photosynthesis.
Step-by-step explanation:
Yes, it is possible that the carbon in a glucose molecule in your cereal was once part of the carbon dioxide exhaled by Albert Einstein, through a process known as the carbon cycle. When cells perform cellular respiration, they convert glucose into carbon dioxide and water, releasing energy.
This carbon dioxide is then released into the atmosphere. Plants, via photosynthesis, absorb this carbon dioxide and use the energy from sunlight to convert it back into glucose and other carbohydrates. These plants are then consumed directly or indirectly (through the food chain) by other organisms.
Thus, a carbon atom from Einstein's breath could have been incorporated into glucose through photosynthesis, later becoming part of the cereal you eat.