| Aerobic bacteria (1) |  |
| Anaerobic bacteria (1) | |
| Bacteria (1835) | |
| Cyanobacteria (79) | |
| Endospore bacteria (68) | |
| Gram-negative bacteria (444) | |
| Gram-positive bacteria (146) | |
| Proteobacteria (14) | |
| Spirochete (1) | |
| Aerobic bacteria (1) | |
| Anaerobic bacteria (1) | |
| Bacteria (1835) | |
| Cyanobacteria (79) | |
| Endospore bacteria (68) | |
| Gram-negative bacteria (444) | |
| Gram-positive bacteria (146) | |
| Proteobacteria (14) | |
| Spirochete (1) | |
including the Lyme spirochete, West Nile virus, and Hanta viruses. Recent studies suggest that contact with nature can have positive effects on our mental health.
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