According to the figure below, approximately how many years ago did oxygen finally get to half its current abundance in Earth's atmosphere? 
A) 3 billion years ago
B) 1 billion years ago
C) 0.6 billion years ago
D) 0.25 billion years ago
E) 0.1 billion years ago
Correct Answer:
Verified
Q19: Earth releases the energy it receives from
Q20: Which of the following processes did NOT
Q21: If you found absorption from _ in
Q22: For the first 1 billion years of
Q23: How does the fraction of oxygen in
Q25: Approximately how long after the Solar System
Q26: A gas eventually will escape from a
Q27: If an average hydrogen atom in Earth's
Q28: If photosynthesis were to disappear on Earth,
A)
Q29: By examining the three images in the
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