(Question)
Q: What are solutions that maintain a relatively constant ph when an acid or a base is added? Choices: - gases - water - liquids - buffer A:
(Answer)
buffer

(Question)
Q: What is needed by all known forms of life? Choices: - nitrogen - warmth - air - water A:
(Answer)
water

(Question)
Q: What does an underwater spider use to breathe and keep alive? Choices: - forehead air bubble - gills - metallic air bubble - shiny air bubble A:
(Answer)
shiny air bubble