HELP NEED DONE BY 11 am on 12-8-2018 central time

Explain the differences between blood, as well as blood-forming organs, and certain disorders involving the immune mechanism. Which ones (blood forming organisms, parasites, or diseases) stand out to you, and why?

Please include the name of the person or question to which you are replying in the subject line. For example, “Tom’s response to Susan’s comment.”