As the first negative cross examiner in a debate about banning animal testing, it's crucial to prepare thoroughly. Focus on developing a list of arguments that the affirmative side might present and prepare counterarguments for each. Key strategies include listening carefully to the opposing side's points and challenging their credibility by emphasizing the importance of animal testing in medical advancements. Highlight specific cases where animal testing has led to significant medical breakthroughs, such as treatments for cancer, and ask the affirmative to justify the potential consequences of banning such practices. Utilize emotional appeals by referencing real-life scenarios, like the plight of children with cancer, to put pressure on the opposition. Researching credible sources, such as Jane Goodall, can provide valuable insights and strengthen your position. Observing debates and discussions on forums can also help anticipate arguments and refine your approach.