Most of the hormones of which gland are peptide in nature?

What is coordination?

Arrange the following events in the correct sequence for the regulation of blood sugar level:
$(i)$ Increase in blood sugar level
$(ii)$ Increase in circulating glucagon
$(iii)$ Release of glucose from glycogen
$(iv)$ Decrease in blood sugar level

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Pituitary gland	$(i)$ Grave's disease
$(b)$ Thyroid gland	$(ii)$ Diabetes mellitus
$(c)$ Adrenal gland	$(iii)$ Diabetes insipidus
$(d)$ Pancreas	$(iv)$ Addison's disease

Mark the incorrect statement.

Identify the odd one out.