When rosalie falls asleep at a park next to an elementary school, the ringing bell wakes her up. she immediately jumps to her feet and starts to pack up her bag because she has been conditioned to think the ringing bell signifies the end of class and the need to go somewhere else. when rosalie was little, before ever attending school, the sound of a bell was a

Neutral stimulus

Explanation:

The neutral stimulus is a neutral stimulus. The neutral stimulus does not respond to an automatic response. In the classical experiment, there is a neutral stimulus that changes into the conditional response.  

For instance when Puja called her friend there was ringing a caller tune that Puja does not like so much but her friend like it when same ring tone play on radio then Puja had not strong reaction about the ring tone but Puja friend like it so much so ring tone is neutral here for Puja because it does not elicit any strong emotions for that ring tone for Puja.

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

they produces sugar..

hope this , question was a little open ended