<span> the atmosphere holds about 21 per cent oxygen. Over the Earth’s 4.6 billion year history, oxygen did not appear in the atmosphere until perhaps about 2.5 billion years ago. Since then, oxygen levels have fluctuated in tandem with global geological and biological events, such as mass extinctions.</span>
I think it’s the andromeda cause scientists have said that Andromeda might be eating Milky Way.
C. Groups 13-16 contain metalloids.
If you look on a periodic table, these usually have a different color.
Explanation:
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Answer:
Carbon
Explanation:
The non metal in the same group as Pb is carbon or C .
I hope this helps you.
