Answer:
Thin fur is helpful in hot environments, but harmful in cold environments
The answer would be Oxygen
Hydrogen, oxygen, nitrogen, and carbon
I believe it is phosphate.
One of the reasons the plasma membrane can have<span> selective permeability</span><span> it's because it's composed by a bi-layer of phospholipids.
The interaction between them and other molecules will influence how these molecules will cross the membrane. If the molecule it's </span>hydrophobic it can easily cross, if it's polar molecules and ions( hydrophilic), they cannot cross easily.