The words which comes in the blanks are NADH and electron.
<span>A molecule generated in both glycolysis and krebs cycle, called NADH , donates electrons to the first protein in the electron transport chain.
Kerbs cycle is also known as citric Acid cycle or tri-carboxylic acid cycle.
</span>NADH<span>, stands for nicotinamide adenine dinucleotide, and it is an important pyridine nucleotide.</span>
        
             
        
        
        
Definitely #2 is the answer
        
             
        
        
        
Cuando sientes como mariposas en él estomago
        
             
        
        
        
Answer:
Yeast is used to make the bread soft and fluffy . Yeast cells thrive on simple sugars . As the sugars are metabolized , Carbon dioxide and alcohol are released into the bread dough making it rise . So the bread becomes soft and fluffy. The baker made great bread.
Explanation: