I do not like how the conclusion is started:
"On the other hand, if the specific research..."
You can never conclude with definite proof that a hypothesis is right or wrong, you can only provide evidence that suggests its validity. Because, down the road, there may be more evidence that suggests otherwise; this is why no journal article ever proves anything, technically. Anyway, let's continue...
The fact your teacher asks these questions:
Reflecting back on the assignment, discuss your own thoughts on the quality of evidence that you used to draw your conclusion. Are the sources trustworthy and reliable? How do you know? Did you lean too heavily on one source, or use a variety of sources? Did you use websites or journal articles? (Note that if you have used only journal articles, the quality of your evidence is likely to be high but limited by the number of references that you were able to collect.) What impact is this likely to have had on your conclusion?
(Length: 50-80 words)
... doesn't mean you have to answer them. They're there to help guide you with your writing. Of course, if you find information in a journal article, it already HAS integrity: you don't need to discuss why it doesn't. In fact, if it didn't have integrity, it would have never been published by professionals in the field. You spend the first two paragraphs of the evaluation discussing this, and that's not right at all.
You can say that "this paper shows a relationship between strictly formula-fed babies versus breast-fed babies and the development of onset diarrhea, but there are limitations in what we currently know. For instance, we can only assume that the pathogen responsible for the disorder is caused by the Rotavirus, yet there are..."
See my notes below: