NO аbbreviаtiоn, LOWERCASE letters ONLY Mr. Mаnganо grоund some beef to make hamburger patties. After grinding, he stacked the patties together. Upon returning, he found out that the interface between patties had turned brown. The reason they turn brown is that during grinding, [1] from the air is mixed within the ground beef, and [2] (choose ONE: reduces/oxygenates/exchanges electron with) myoglobin to form [3] (a nomenclature of myoglobin form) with bright cherry red color. As he stacked patties, the oxygen partial pressure decreases to a low level between 2.6% to 5.3%, causing [4] (choose ONE: reduction/oxidation/oxygenation/exchanges electron/reaction) of myoglobin to a compound called [5] (a nomenclature of myoglobin form) with [6] color.