Once assembled, what is the key to a protein's unique function?

Once assembled, what is the key to a protein's unique function? The manner in which proteins fold is the key to their function

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

check for the pregnancy rating of drug. if its class c or d see if other alternatives