Scientists speculate that the formation time of primitive life is about how many years after the formation of the earth__________
A. 1 billion years
B. 1.5 billion years
C. 2 billion years
D. 4 billion years
Answer:D
Scientists speculate that the formation time of primitive life is about how many years after the formation of the earth__________
A. 1 billion years B. 1.5 billion years C. 2 billion years D. 4 billion years