Hello. You did not show the results of the study to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
Antibiotics that were most effective in overcoming bacterial resistance and killing a large number of bacterial colonies, if not all, should be chosen. In that case, antibiotics are chosen where the bacteria are more susceptible and fragile. In relation to bacteria B. subtilis, the antibiotics clindamycin and vancomycin, tend to be more efficient.
Chronological order, chronological means “relating to time”
Line 7 uses personification.
The author is giving human-like attributes to the sunbeams, as they’re implying that the sunbeams “play” around.
She is supporting an inference from the text. An inference is something that is implied, and the person saying they've "witnessed much fighting" infers that they're old, whereas "I am wounded with iron" can be taken to mean he's been wounded by a weapon like a sword.
