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The student needs to add A. krypton and D. barium.

The answer to your question is: Krypton and Barium

Explanation:

                 Uranium -235    ⇒    Kripton      +    Barium

                    92 p              =          36 p        +       56 p    = 92 p

                    143 n            =           53 n        +       88 n    = 141 n

scorpions are,

c.arachnids

  scorpions are animals in the order scorpiones, under the class arachnida, which makes them a distant cousin of spiders

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if they have a finite resultant