Answer:
Respiration uses NADH as an electron carrier, fermentation does not
Step-by-step explanation:
Respiration is the process of chemical reactions, in oxidising food to generate energy.
Fermentation is chemical breakdown of organic substrate, like glucose, by microrganisms like bacteria & yeast.
Difference between them is that : Respiration process uses NADH in oxidative phosphoralytion for ATPs . However, fermentation doesn't include use of NADH in oxidative phosphoralytion for ATPs.