__________ are phototrophic biofilms that have interacted with calcium carbonate (CaCO₃) to form fossils.

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Stromatolites are formed when phototrophic biofilms (often composed of cyanobacteria) interact with calcium carbonate in a process known as calcification. This process can result in the formation of fossils over time. Sedimentary mats and microbial mats may also contribute to the formation of stromatolites, but they are not specific to this process. Microfossils may also be found within stromatolites, but they are not the same as the structures themselves.

__________ Are Phototrophic Biofilms That Have Interacted with Calcium Carbonate