Which one is correct. Btw I accidentally clicked on the first one and cant undo.

What is the role of fadh2 in cellular respiration

Using the periodic table, determine which material is most likely a good conductor

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2