The mineral __________, precipitated by mucus in ancient cyanobacteria biofilms, resulted in the formation of fossils that resemble today's ____________. A) hydroxyapatite; Nautilus shells B) FeO; banded iron formations C) CaCO₃; stromatolites D) all of the above E) none of the above

Question

Quizplus · Accepted Answer

The mineral CaCO3 (calcium carbonate) precipitated by mucus in ancient cyanobacteria biofilms resulted in the formation of stromatolite fossils. Option A is incorrect as hydroxyapatite is a mineral found in bones and teeth, not associated with cyanobacteria. Option B is incorrect as FeO (iron oxide) is associated with banded iron formations, which are formed by precipitation of iron from the ocean, not by cyanobacteria. Option D is incorrect as all options are not correct.

The Mineral __________, Precipitated by Mucus in Ancient Cyanobacteria Biofilms