Why are NADH and FADH2 necessities in the electron transport chain? A) They help form water.

B) They donate electrons.

C) They help break up CO2.

D) They pick up electrons.

NADH and FADH2 play a fundamental role in the electron transport chain because they PICK UP electrons (Option D).

NADH and FADH2 play a fundamental role in the electron transport chain because they pick up electrons (i.e., they are electron carriers) from one molecule and drop them off with another (Option D).

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stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

69 is the correct math for the amino acids