C-12-Q099mediumsingle_mcq
According to the textbook, 2.6 billion years ago the earth's atmosphere lacked—
According to the textbook, 2.6 billion years ago the earth's atmosphere lacked—
- aMethane
- bAmmonia
- cOxygen
- dNitrogen
According to the textbook, 2.6 billion years ago the earth's atmosphere lacked—