Question

snake scientists. it is their only job, and it is a dangerous one.
which of these clues helps you understand what jam means?
venomous snakes, like this viper, have special teeth called fangs. the fangs contain venom.
milking a snake takes careful work. scientists dont just jam their hands in the snakes mouth. a snake will bite anything that is pushed into its fangs!

Explanation:

The context clue "push into its fangs" helps understand that "jam" means to force something (in this case, hands) into a tight or confined space (the snake's mouth with fangs).

Answer:

"push into its fangs"