C.
Weathering is the only one that doesn't deal with plate tectonics
Biotic and abiotic factors make up an ecosystem. To survive, biotic factors need abiotic factors
reduce lipid mobility
decrease membrane fluidity
When fatty acid tails are saturated, it means that their conformation is perfectly straight becoming easy to compact more and more fatty acids, as they fit perfectly together, and therefore reducing lipid mobility. In turn, if lipid mobility is reduced, the membrane fluidity is decreased because the lipids are too "stiff" together.
