*Question*
Q: The heart, blood vessels, and blood make up which system in the body?    Choices:  - digestive  - pulminary  - respiratory  - cardiovascular  A:
**Answer**
cardiovascular

*Question*
Q: Motion of water molecules helps break up interactions between what?    Choices:  - ions or hormones  - acids and bases  - enzymes and acids  - solid ions or molecules  A:
**Answer**
solid ions or molecules

*Question*
Q: Silk and cotton are examples of what type of fibers?    Choices:  - mechanical  - artificial  - coral  - natural  A:
**Answer**
natural

*Question*
Q: A largemouth bass is an example of a cold-blooded animal that conforms to what aspect of the lake it inhabits?    Choices:  - depth  - precipitation  - oxygen  - temperature  A:
**Answer**

temperature