Explanation:

Poison gland of snakes is homologous to salivary glands of vertebrates. Here Homologous Means having the same relation or relative position or structure. Here in snakes poison is in glands and here salivary glands are in Vertebrates. alivary gland. Salivary gland, any of the organs that secrete saliva, a substance that moistens and softens food, into the oral cavity of vertebrates. Salivary glands may be predominantly serous, mucous, or mixed in secretion. Mucus is a thick, clear, and somewhat slimy substance. Snake venom is actually the refined from of its saliva.