Answer:
C
Explanation:
A. Since
B. Because
C. Although
D. For example
<em>Zebra mussels have been known to have a lifespan of six or seven years in the past but recent discoveries have shown that their average lifespan now ranges between one to two years. Hence, the correct word to fill in the gap would be 'Although'. </em>
<em>The correct option is C</em>
Answer:
The correct answer would be NADH and FADH₂.
Electron transport system (ETS) or electron transport chain (ETC) refers to the series of complexes present in the inner membrane of the mitochondria.
These complexes act as electron carriers which transfer high energy electrons provided by NADH and FADH₂ to oxygen to form water.
When these high energy electrons travel through ETC they loose energy some of which is used by these complexes to pump hydrogen ions into the inter-membrane space of the mitochondria.
It leads to the formation of proton gradient across the inner membrane which is used by the ATP synthase (also located in inner membrane) to phosphorylate ADP into ATP.
