Question

multiple choice question. the oldest known fossils are about 3.7 billion - year - old and resemble formations called __ made by prokaryotes called __. o stromatolites; cyanobacteria o sulfur deposits; brown algae o salt deposits; salt - loving bacteria o quartz crystals; red algae

Explanation:

The oldest known fossils are about 3.7 billion - year - old stromatolites formed by cyanobacteria. Stromatolites are layered sedimentary structures created by photosynthetic prokaryotes like cyanobacteria.

Answer:

stromatolites; cyanobacteria