Do snakes have just one venomous gland or can they have two?

snakes have two venomous glands.

Explanation:

Snake toxins vary greatly in their functions. The two broad classes of toxins found in snake venoms are neurotoxins (mostly found in elapids) and hemotoxins (mostly found in viperids).

Although being bitten by a snake may induce fear in individuals, the fangs are not from where the venom comes from, they are mostly pass methods. The spot where the venom is produced is found on the animal's head in special glands.

Explanation:

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one would be wind another would be water density