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Introduction. Bacteria are microorganisms that grow everywhere. We can collect and grow them in specially prepared petri dishes. Blood agar or tryptic soy agar with 5% sheep's blood is an excellent medium for supplying bacteria with nutrients and an environment in which we can see them grow.
Scientists believe that the photosynthetic activity of cyanobacteria, the most important group of stromatolite-forming microorganisms, generated the oxygen in our atmosphere.An oxygen-rich environment was critical to the development of higher forms of life on Earth.cientists believe that the photosynthetic activity of cyanobacteria, the most important group of stromatolite-forming microorganisms, generated the oxygen in our atmosphere.