Question

Stromatolites are _____. a type of fossil dinosaur. produced by cyanobacteria. the earliest mammals. the earliest fossils. found as early as the Archean era.

Answer 1

The correct answer is they are produced by cyanobacteria.

Stromatolites are being produced by cyanobacteria.

Stromatolites are termed as layered mounds, which have columns and also sheet like rocks which are originally formed with growth of layers.

Lichen stromatolites is a type of stromatolite which is formed by layered structures rocks and they are formed above water.

Answer 2

Answer:  produced by cyanobacteria.

Explanation:

Stromatolites are sedimentary rocks in the form of layered mounds, sheet like structures, columns and dome shaped structures. The primary composition of these sedimentary rocks is the limestone. These are found in the shallow waters and are usually formed by the cynobacteria and other single celled organisms such as algae and lichen.