Throughout the article, what does the author mainly use to support statements about the defense systems of insects?

Hi. You did not enter the article to which this question refers, which makes it impossible for it to be answered. However, I will try to help as best I can.

We can say that the author uses textual evidence to support the assertions about the insect defense system. What is this evidence, however, is only possible to know by reading the article, but I can tell you that these textual evidence are the sentences that justify the author's ideas about the insect defense system. These claims are able to justify the author's ideas because they show evidence that these ideas are true. In that case, to answer this question, you must read the text and identify this evidence.

the right answer is 6

i would say the correct answer is not concrete.