Answer:
Charles Darwin came up with the theory of evolution.
The three grains are rice, wheat, and corn
Rice is the main grain used in places such as Asia ans SEA, corn is mostly used in the Americas, while wheat is mostly found in European countries.
The body can only synthesize 11 of the 20 amino acids, all other nine needs to be incorporate with food and those are the ones that we call essential amino acids.
Most of the metabolic cycles use carbon coming from glycolysis, the pentose phosphate pathway or the Krebs cycle.
