Biology
Fossils of blue green algae were found in lime stones with the age almost as old as

2.3 Billion years
3.3 Billion years
4.3 Billion years
1.3 Billion years

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Biology
A genus can best be defined as

The most specific taxon
A taxon composed of one or more species and a classification level lying below family
A taxon comprised of classes
A taxon composed of families

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