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Answer 1

Answer:

1 Anaerobic Anaerobic

2 Methanogenic bacteria generate ATP by synthesizing methane under strictly anoxic conditions, most commonly by the reduction of carbon dioxide with hydrogen. All known methanogens are euryarchaeote Archaea. ... Methanogenic symbioses are prevalent in anaerobic ciliate protests.

3 Retting is a process employing the action of micro-organisms and moisture on plants to dissolve or rot away much of the cellular tissues and pectins surrounding bast-fibre bundles, and so facilitating separation of the fibre from the stem.

4 yeast

5 The four dominant bacterial phyla in the human gut are Firmicutes, Bacteroidetes, Actinobacteria, and Proteobacteria. Most bacteria belong to the genera Bacteroides, Clostridium, Faecalibacterium, Eubacterium, Ruminococcus, Peptococcus, Peptostreptococcus, and Bifidobacterium.

6 Such acid loving microbes are called acidophiles. Even though they can live in very acid environments, their internal pH is much closer to neutral values. Some bacteria produce acid as they grow. This acid is excreted and lowers the pH or the surrounding environment.