Answer:
The biggest breakthrough came in 1921 when Frederick Banting and Charles Best conducted a series of experiments one summer in the laboratory of J.J. R. Macleod at the University of Toronto. Like Minkowski and von Mering, they showed that removing the pancreas from dogs made them diabetic.
Explanation:
Because brain damage accrues after only 3 minutes without oxygen, which causes death.
Because it will kill them because of a chemical found in chocolate
