I'm a bit confused by それぞれ and ずつ.

What would the difference be between these three sentences:

> それぞれの生徒にオレンジを二個ずつあげた
>
> 生徒にオレンジを二個ずつあげた
>
> それぞれの生徒にオレンジを二個あげた
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2018-04-24T12:16:14.727
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2018-04-24T12:16:14.727
2020-06-17T08:18:27.500
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それぞれ and ずつ use and differences