Input (grade 13): The cooking of meat, as evident from burned and blackened mammal bones, makes the meats easier to eat and easier to attain the nutrition from proteins by making the meat itself easier to digest.
Output (grade 8): The cooking of meat, as can be seen from burned and blackened mammal bones, makes the meats easier to eat. It is also easier to get the nutrition from proteins because the meat itself is easier to digest.