Answer:
The Pearson square ration formulation procedure is designed for simple rations.
In order for the square to work, follow specific directions for its use.
Nutrient contents of ingredients and nutrient requirements must be expressed on the same basis (i.e., dry-matter or “as-fed”).
An advantage of the syringe method is that blood appears in the hub when the vein has been entered.
All of them could be intentional/unpreventable, we are only talking about an injury so I would say the plane crash.