F because both scientist are unsure so they would have to reevaluate their decision
The answer is C. present; first-person
The introduction is the beginning of an essay , when the readers read your essay the introduction is basically going to tell them the main idea or the plot , the introduction supports the whole thing that you are writing , basically you are giving all the things that are going to be discuss.Without this the whole body of the text is not going to be explicit as necessary .
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