What does "those" refer to in this sentence?

Hello,

In the last paragraph of a scientific article below, there is a sentence “It also limits potentially qualified students from participating in the talent pool tapped to fill advance jobs where the work force in dwindling, such as those in science, technology and engineering."

I copied and pasted this paragraph.

 My question 1:Shouldn’t  “in” before “dwindling” be “is”? Is it a typo?

My question 2: What does “those” in the last sentence refer to?

My question 3: Is “those” necessary for the sentence to make sense?

apple

"Choking is a serious problem, given that poor exam performance affects students' subsequent academic opportunities," she said. "It also limits potentially qualified students from participating in the talent pool tapped to fill advance jobs where the work force in dwindling, such as those in science, technology and engineering."

 https://www.sciencedaily.com/r.../01/110113141605.htm

Original Post
×
×
×
×