Carbon is capable of creating a huge number of different kinds of chemical compounds and bonds with other atoms, and this kind of versatility makes it an integral part of basically every process in life on Earth. It can form strong bonds to make it part of things like DNA and proteins that make up life. Because of this the study of chemistry involving carbon is called “organic chemistry”.
All life on Earth is not only carbon-based, but also related to each other and have a common ancestor.
> And why arent some others?
There is no known form of life which isn’t carbon-based. However there doesn’t seem to be any reason why life *couldn’t* happen without carbon, so maybe there is alien life somewhere out there which isn’t carbon-based. But we don’t have any evidence that it exists.
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