rely (verb) to depend

• Sample Sentence: Why do we rely on animals when we test our products for safety?
• Turn and Talk: Who do you rely on for advice when you are facing a difficult problem?

react (verb) to respond

• Sample Sentence: If animal testing is designed to protect humans, then why do so many people react negatively to it?
• Turn and Talk: How would you react if you found out that an animal you knew was being mistreated?

alternative (adjective) other, different

• Sample Sentence: Companies that use alternative methods of testing products advertise to people who avoid products tested on animals.
• Turn and Talk: Instead of arguing, what are some alternative ways of solving a disagreement?

*alternative (noun) different option or possibility

• Sample Sentence: Dancing and playing team sports are alternatives to exercising in a gym.
• Turn and Talk: What are some alternatives to taking medicine when you have a headache?

justify (verb) to show or prove to be right; to defend

• Sample Sentence: Some people argue that helping humans does not justify animal testing.
• Turn and Talk: Is it possible to justify copying someone else’s homework?

proportion (noun) fraction; compared amounts; amount as compared to a whole

• Sample Sentence: Only a small proportion of medical researchers inflict pain or harm on animals.
• Turn and Talk: What proportion of your classmates have you known for more than two years?