Hello. You did not enter the text 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.
The evidences are elements of a text that promote a justification about an argument presented by the author. In this case, the evidence aims to prove that the author's argument is true, through information, examples, facts and data. If the evidence is capable of proving the author's argument in a coherent and cohesive manner, it is strong evidence, otherwise, it is weak evidence.
I think that web diagramming is more of a writing strategy not a reading one. However I am not 100% sure! I'm sorry! I hope you get the correct answer!
