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