Which option explains the first known mass extinction? A)The first known mass extinction is in Precambrian era. It was caused by carbon dioxide. The carbon dioxide was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that did not use carbon dioxide.

B)The first known mass extinction is in Paleozoic era. It was caused by oxygen. The oxygen was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that used oxygen.

C)The first known mass extinction is in Paleozoic era. It was caused by carbon dioxide. The carbon dioxide was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that did not use carbon dioxide.

D)The first known mass extinction is in Precambrian era. It was caused by oxygen. Oxygen was produced by some types of bacteria performing photosynthesis. This event wiped out most of the bacteria that did not use oxygen.