Which of the following environmental changes is thought to have contributed to the Cambrian explosion?
A) a decrease in oxygen levels in the atmosphere
B) an increase in carbon dioxide levels in the atmosphere
C) an increase in oxygen levels in the atmosphere
D) a large meteor impact that spread ash into the atmosphere

Question

Quizplus · Accepted Answer

The Cambrian explosion, a period of rapid diversification of life forms approximately 541 million years ago, is thought to have been facilitated by an increase in oxygen levels in the atmosphere. This increase in oxygen would have supported more complex life forms, leading to the diversity observed in the fossil record from this period.

Which of the Following Environmental Changes Is Thought to Have