1- Synthesize this hormone
3- a decrease in the amount of glucose in the blood
4- may have fewer side effects then the insulin previously extracted from the pancreas of other animals
5- release of insulin
6- different parts of an individual's DNA are used to direct the synthesis of different proteins...
Looking at the features of past species you can determine how old and what differences they have from fossils.
There could be several orgins
bpwhamburgorchardpark.org Has a short video on it