It has two phosppholipid layers that are either hydrophobic and hydrophillic the function is to protect thing from coming in and out
The theory of evolution would be the correct answer.
I hoped this helped!
There are 1 to 2 called alleles
The one that helps identify leaves as monocot or dicot are the characteristic of their veins. In a monocot, leaves have parallel veins or parallel venation; whereas, dicot leaves have a network of veins or reticulate venation. Hope this is the answer that you are looking for. Have a great day!