Animals , Plants , Bacteria
Answer:
I think it is D.) Scientist have spent years trying to determine how tsunamis can be predicted with greater accuracy.
Explanation:
Words like ain't, you guys, or y'all would not be worlds you would want to put in a formal style or tone.
So, words such as determine, predicted, and greater accuracy, are formal in a way. Just think of it this way, the sentence would sound as if someone who was smart was speaking or someone who is very FORMAL.
I hope this helped you ; )
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The subjunctive mood or the imperative mood
