Figure 1 Stromatolite structures composed of cyanobacteria, which secrete calcium carbonate, forming large stony masses. the world’s oldest fossils are probably stromatolites and provide unique evidence of the first prokaryotic life on Earth.
FOTOLIA
Microbe
Pathogen
Your organisation does not have access to this article.
Sign up today to give your students the edge they need to achieve their best grades with subject expertise
Subscribe
