The nervous system and endocrine glands are

Select the correct option regarding the endocrine systems of invertebrates and vertebrates.

Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

Identify the difference between the following pairs:
$(1)$ Neural system - Endocrine system
$(2)$ Oxytocin - Vasopressin
$(3)$ Dwarfism - Gigantism
$(4)$ $FSH - LH$

$I.$ Somatostatin inhibits intestinal absorption of glucose.
$II.$ Leydig cells secrete progesterone.
$III.$ Melatonin is secreted by the pineal gland.
$IV.$ Myxoedema is a thyroid disorder.
$V.$ Neurohypophysis secretes $ACTH$.
Select the correct statements and choose the option.

Calcium plays a very important role in the formation of bones. Write about the role of endocrine glands and hormones responsible for maintaining calcium homeostasis.