(Question)
Q: For what kind of animal is communication essential? Choices: - anti-social animals - new born animals - migrating animals - social animals A:
(Answer)
social animals

(Question)
Q: What is the term for a solution that resists dramatic changes in ph? Choices: - inert - neutral - stable - buffer A:
(Answer)
buffer

(Question)
Q: Why did people stop adding lead to gasoline? Choices: - bad smell - to expensive - explosions - environmental pollution A:
(Answer)
environmental pollution