Which gas was least abundant in Earth's early atmosphere, prior to 2 billion years ago?
A) O₂
B) CO₂
C) CH₄
D) H₂O
E) NH₃
Correct Answer:
Verified
Q7: Which of the following has not yet
Q8: Which measurement would help determine absolute dates
Q9: If natural selection in a particular environment
Q10: If relatively small carbonaceous chondrites from space
Q11: What is True of the amino acids
Q13: The first genes on Earth were probably
A)DNA
Q14: RNA molecules can both carry genetic information
Q15: In their laboratory simulations of the early
Q17: Which is a defining characteristic that all
Q18: Several scientific laboratories across the globe are
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents