I think the correct term to fill in the blanks would be glycerol phosphate electron shuttle. This shuttle is responsible of transporting agents that are reducing into the inner membrane of the mitochondria. Since NADH cannot enter, it is reduced so that the electrons could go in to the transport chain.
Plant absorb nitrogen gas from bacteria in the soil
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Puppies from the same litter commonly share 50% of their genes (on average.) Each litter mate randomly inherits 50% of its genes from his father and the other 50% from his mother. The only thing here is that they do not necessarily the same 50% from each
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