Any fat. Like oil. Fats are hydrophobic, so they resist water and don't mix.
For the second wig its decreasing
The answer is confirmation bias. This is the tendency to look for evidence that will confirm ones hypothesis and ignoring anything else that does not lead to the hypothesis. In this situation confirmation bias is evident due to the fact that you look for anything that confirms your hypothesis and ignore anything else that does not point to drug abuse.
Just to add on over time they have develiped a tuff outer layer to stop weather and insects from harming them.
