Habitat Approximate nuber of bacteria Garden soil(surface) 9.7X105/ Garden soil (30 cm deep) 5.7×10/g Lakewater(shallow) 104m Lakewater(deep) 102m Seawater 1.1×10°/m1 Human skin Human mouth 10m Human intestine 4×10/g Milk 103to106m Cheese g Sunlit surface few Air few