Answer
E. Thermophilic bacterium that lives in hot springs at
100°C.
Work Step by Step
Comparing the creatures listed, a thermophilic bacteria that lives in hot springs at 100°C is more likely to have the highest proportion of unsaturated phospholipids in its membranes. This is so that cell membranes may keep their fluidity and function normally in high-temperature conditions. This is because unsaturated phospholipids are more fluid and flexible than saturated phospholipids.
