Q1. Fundamental niche Q2. Presence of a cellulose matrix to hold the organisms together. Q3. there will be less oxygen available for the aquatic life due to microbial activity Q4. Oxygen minimum zone Q5. Piezophiles. Solution Q1. Fundamental niche Q2. Presence of a cellulose matrix to hold the organisms together. Q3. there will be less oxygen available for the aquatic life due to microbial activity Q4. Oxygen minimum zone Q5. Piezophiles..