Instead, a scientist holds a snake near a glass container The scientist must press the snake's head. The scientist has learned to squeeze the snake's head just right, so that the snake opens its mouth. Then the snake bites down on the container. As the snake bites, the poison squirts out of its fangs and into the container​

To push in from both sides

Explanation:

Since your squeezing it your making it squished

sing because that is what they are doing in the sentence

explanation:

the simple predicate is the main verb in the predicate that tells what the subject does. example: my father fixed the dryer. read each sentence. draw a line under the complete predicate.