Q: Researchers have identified the receptor proteins for all of the tastes except which?    Choices:  - sweet  - bitter  - acid  - salty  A:
salty

Q: What are used to balance chemical equations?    Choices:  - velocities  - densities  - fractions  - coefficients  A:
coefficients

Q: What do we call the seasonal movement of animals?    Choices:  - population  - trade  - immigration  - migration  A:
migration

Q: Iron will do what when it is exposed to oxygen and water?    Choices:  - become hot  - expand  - contract  - rust  A:
