| Column-$I$ | Column-$II$ |
| $(A)$ Halophiles | $(p)$ Gram-positive bacteria |
| $(B)$ Firmicutes | $(q)$ Hot springs habitat |
| $(C)$ Methanogens | $(r)$ Gram-negative bacteria |
| $(D)$ Spirochetes | $(s)$ Photosynthetic bacteria |
| $(E)$ Thermoacidophiles | $(t)$ Extremely salty areas habitat |
| $(u)$ Responsible for biogas production |
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