When is it ethical to use a human in a research study?

When is it ethical to use a human in a research study? An animal? Mention some specific issues in your discussion.

Use a quote from the chapter 4 support your position in the discussion. List the page number and the topic heading (if you use the ebook exclusively, there are no page numbers). First, write the quote in the body of your post. Then, leave a paragraph space and relate a detailed, specific application of what you have quoted. The quote may be a sentence or part of a paragraph. Make sure the quote and your response are specifically related to the discussion question.