Multiple Choice
The simplest life forms appeared on Earth when it was how old?
A) five million years
B) one billion years
C) 2.5 billion years
D) 3.5 billion years
E) 4.5 billion years
Correct Answer:
Verified
Correct Answer:
Verified
Related Questions
Q13: The _ habitable zone is set by
Q14: The radio signals from Earth are greater
Q15: For which of these forms of life
Q16: As yet, no human probe has completely
Q17: Which of these technological advances would make
Q19: Define "intelligent civilization" according to Drake.
Q20: The book discussed two different "zones of
Q21: Which of the following appears most favored
Q22: What is an organic molecule based on?
Q23: What is meant by the "habitable zone"?<br>A)the