Ying no longer eats egg salad sandwiches because some time ago she found herself vomiting after consuming a sandwich that probably had bacteria in it due to spoiled mayonnaise. What is the unconditioned stimulus in this example of a taste aversion?

Bacteria

Explanation:

There are some things that could make people detest an activity, food, event or anything at all, and when this happens ones, they would rule off doing that activity or eating that food until they are convinced otherwise even though what happened wasn't a normal occurrence. Ying happens to be in this category of people as she detest eating salad sandwich due to her experience with it and bacteria sometime ago, these is known as unconditioned stimulus

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; attention;