Cambrian age. How long ago did the Cambrian period begin?
A. 6 billion years
B. 54 million years
C. 540 million years
D. 65.4 million years
Answer:C
Cambrian age. How long ago did the Cambrian period begin?
A. 6 billion years B. 54 million years C. 540 million years D. 65.4 million years