According to the recent study of coastal pathogen, the total number of bacteria that is estimated to be present on the planet is 10 power 30 or one nonillion. This estimatation is taken by choosing the wide variety of microbes such that the density of cells from samples taken which is multiplied with the total mass of each microbe.
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We can say infinity or more because each small thing and big thing in this world it self contains millions and trillions of micro organisms inside them.we can say that the micro organisms are the building block of any substance   but it is very difficulty to count them or watch tem because their size is extremely small