Which is the oldest fossil record of blue-green algae that is 2.9 billion years old?

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Stromatolites

Archaeopteryx

Archaeo Spheroids

Chlamydomonas

answer is C.

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Detailed Solution

Concept: The cyanobacteria also known as blue-green algae are a type of bacterium. When scums are dying, they occasionally may turn bluish and have a green appearance in general.
The cyanobacteria, sometimes known as "blue-green algae," are one type of bacteria that have left a fossil record that dates all the way back to the Precambrian. The oldest known fossils, including those that resemble cyanobacteria, date back over 3.5 billion years. The oldest known form of life, a bacterial micro fossil called Archaeo Spheroides barbertonis, was found here. Its age is estimated to be 3.2 billion years old. The oldest fossil found in India is a 2.9 billion-year-old blue chlorophyte.
Hence, option 3 is the correct answer.

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