Select all of the answers that apply. stromatolites are a type of fossil dinosaur produced by cyanobacteria the earliest mammals the earliest fossils found as early as the archean era

Answer is 
produced by cyanobacteria
the earliest fossils
found as early as the Archaen era

Stromatolites are some of the earliest fossils and are often found in or constituting rocks near oceans. They were formed by the fossilization of single-cells cyanobacteria, which produced their food through photosynthesis and still exist today. Some date back to the Archean era.