Question

four groups of bacteria​

Answer 1

Explanation:

The four dominant bacterial phyla in the human gut are Firmicutes, Bacteroidetes, Actinobacteria, and Proteobacteria.

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Answer 2

Studies have shown that of the bacteria found in indoor air, the most common four are: Micrococcus, Staphylococcus, Bacillus, and Pseudomonas. Micrococcus is a sphere-shaped (coccus/cocci generally means spherical), relatively harmless bacterium.