How can one have an imbalance in a substance, but not actually have elevated or deficient levels of that substance in the body?

the answer is 1. photosynthesis. glad to

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!

because photosynthesis could not occur (apex)