Which of the following did not occur during Precambrian time?

Question

Quizplus · Accepted Answer

Ancestors of all modern animals appeared much later in the geological time scale, during the Cambrian period which began about 541 million years ago. Precambrian time refers to the earliest period of Earth's history, which spans from the formation of the planet about 4.6 billion years ago to the beginning of the Cambrian period. Life originated, photosynthesis evolved, O₂ accumulated in the Earth's atmosphere, and eukaryotes arose during Precambrian time.

Which of the Following Did Not Occur During Precambrian Time