Question

question 8 (1 point)
what is the significance of stromatolites?
they are composed of benthic patches of bacteria found at hydrothermal vents.
cyanobacteria produce carbonate structures in warm shallow seas that can date back to 3 billion years ago.
they are composed of siliceous deposits of diatoms and dinoflagellates.
they are composed of biogenous deposits of foraminiferans and coccolithophores.

Explanation:

Stromatolites are layered structures formed by cyanobacteria in warm - shallow seas. They are among the oldest known fossils, dating back about 3 billion years.

Answer:

Cyanobacteria produce carbonate structures in warm shallow seas that can date back to 3 billion years ago.