Narrowing My Focus

I will chose three of my favorite questions from the previous post and explain why I think they are the most important to answer.

Melki, Serge "The narrow streets of Barcelone" 3/6/09 via Wikipedia. Attribution 2.0 Generic.

How effective is animal testing in catching problems in drugs?
Is there a more accurate model to the human body than animals? If so, what is it?
How do cultural values impact this controversy?

I chose these questions because I have an idea of what the answer to all of them are, I can relate them, there are more sources about these questions than any of the others, and I know what argument I want to make using the answers to these questions. I have an idea of what the answers are but I need to read more about it to make a compelling argument.