Which of These are Fossilized Microbial Mats Containing Photosynthetic Bacteria

Question

Which of these are fossilized microbial mats containing photosynthetic bacteria?
A)Stromatolites
B)Biofilms
C)Resin
D)Cyanobacteria
E)Stalagmites

Accepted Answer

Stromatolites are fossilized microbial mats, which are formed by layers of sediment and photosynthetic bacteria. The bacteria in the mats trap sediment particles and minerals, which over time forms the characteristic layered structure seen in stromatolite fossils.