Cell membrane is like doors and windows!!
if you know how; comment !
The correct answer to this could be numerous words. The most broad term that would fit would be the Cosmos. If you are referring to more specific then you might be saying things such as Ionosphere. That is where Sputnik 1, the first satellite, was launched.
First one is geosphere
second is biosphere
third is atmosphere
Answer:
The appearance of free oxygen in the Earth's atmosphere led to the Great Oxidation Event. This was triggered by cyanobacteria producing oxygen which developed into multicellular forms as early as 2.3 billion years ago
Explanation:
To clarify what I said here are some questions to help!
How did oxygen first appear?
Whiffs in the air is how oxygen first appeared billions of years ago.
For the most part, scientists agree that oxygen, though lacking in the atmosphere, was likely brewing in the oceans as a byproduct of cyanobacterial photosynthesis as early as 3 billion years ago
When was oxygen found?
2.33 billion years ago
Since its first appearance 2.33 billion years ago, oxygen accumulated in high enough concentrations to have a weathering effect on rocks just 10 million years later.
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