Sense of fell is related to sense of touch.
they dont have the sense of touch but they can sense chemicals, to smell or taste.
Yes Coral snakes can sense danger. Many others too. Not all snakes can sense danger. A water snake example, can not sense danger if an animal or human is looking to kill it or hunt it down. Tree snakes also, can not sense danger of near predators ; even pray, which is not danger to the snake, it is food. Snakes have amazing ways! Snakes are beloved animals even some,that are not poisonous, can be pets. Snakes are amazing!
Touch is actually not considered to be a chemical sense. Touch is actually considered to be a physical type sense.
they can sense it
Dry
Nope - to be able to express oneself, one has to be able to feel emotion. Snakes lack the intelligence to feel emotions.
Snakes don't have actual ears; they have holes in their skull that they sense vibrations.
sense of smell
through there tongue
All snakes can't hear but they have a good sense with their tongue.
Hypoesthesia is the term of a diminished sense of touch.