What is the importance of NADH and FADH2? Multiple choice question.

A)These molecules are recycled for use in glycolysis.

B)These molecules are used in the electron transport chain.

C)These molecules are useless by-products.

D)These molecules are used as products in photosynthesis.

B) These molecules are used in the electron transport chain.

Explanation:

NADH and FADH2 are used by donating electrons to the electron transport chain. They both donate electrons by providing an hydrogen molecule to the oxygen molecule to create water during the electron transport chain

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.