What are stromatolite structures built by ?

Stromatolite structures built by: photosynthesizing microbe such as cyanobacteria

Explanation:

Stromatolite has a structure like a rock. They are formed by photosynthesizing microbes such as cyanobacteria.stromatolite is one of the oldest fossils, which are formed in the shallow water and built by the precipitating activity of the bacteria which are phototropic such as cyanobacteria.Another method by which stromatolites are formed by its own process of precipitation.fossilized stromatolite gives evidence of the first ancient life form on the earth. Marine stromatolite is found in hypersaline, whereas nonmarine stromatolite is found in lakes, frozen lakes, and thermal springs.

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