Question

why more percentage of unsaturated fatty acids are more in plasma membrane of animals living in colder areas.​

Answer 1

Answer:

it is to protect themselves from cold

Answer 2

Helo mate here your ans

The short answer is that the cell adapts to regulate membrane state such that it is always on the fluid side of the gel-fluid phase transition. Thus the phase transition is shifted to even lower temperatures under cold conditions and one way to accomplish this is by increasing the unsaturated to saturated lipid ratio. For further details please consult the works of JR Hazel, the following review is a good start

Article Thermal Adaptation in Biological Membranes: Is Homeoviscous ...

hope this ans help you...