The early atmosphere had enough oxygen to support life. Is this true or false?
The early atmosphere had enough oxygen to support life. Is this true or false?
Homework Answers
False. (the given statement is false)
The early atmosphere had no oxygen at all. It was reducing atmosphere with oxygen-free gases, then gradually over a period of 2.5 billion years, the atmosphere became oxygen-rich.
The early atmosphere consists of carbon dioxide, water vapors, methane, hydrogen, ammonia, and sulfur dioxide. Also, sunlight was also present there. Around 2.5 billion years ago, cyanobacteria (chemosynthetic bacteria, also known as blue-green algae) evolved which are capable of doing photosynthesis, they produce oxygen gas with the help of carbon dioxide, sunlight, and water. This creates a huge amount of free oxygen.
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The early atmosphere had enough oxygen to support
life. Is this true or false?
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