The topic "a history of and reasons for animal testing in medical research lab" would be extremely too broad for a 2 to 3 page paper. You might scratch the surface in a 20-page paper, but you'd barely introduce the issues in a 2 to 3 page paper.
In 2 to 3 pages, you could briefly and narrowly focus on topics like:
- Animal Testing for Medical Research Creates Unethical Treatment of Animals
- Animal Testing for Medical Research Promotes Medical Discoveries
- Animal Testing for Medical Research Stirs Strong Emotions in Everyday Persons
- The Beginnings of Animal Testing for Medical Research
- How Animals Used in Animal for Medical Research Live Out their Lives
- Suffering and Death of Animals used in Animal Testing for Medical Research
- Medical Discoveries Possible through Animal Testing in Medical Research
- Countless Rats Don't Count During Animal Testing in Medical Research
- Animal Testing in Medical Research Brings Big Bucks to Pharmaceutical (Drug) Manufacturers
- Fido Fights for Life in Animal Testing for Medical Research