Stromatolites form when(1 point)
Responses
continents drift apart and isolate areas of the biosphere.
continents drift apart and isolate areas of the biosphere.
oxygen reacts with iron in rocky layers.
oxygen reacts with iron in rocky layers.
volcanoes erupt and kill surrounding organisms.
volcanoes erupt and kill surrounding organisms.
cyanobacteria grow on top of rocks and harden as others grow on top of them