*Question*
Q: The cells of all protists have a what?    Choices:  - argon  - cell walls  - protons  - nucleus  A:
**Answer**
nucleus

*Question*
Q: Carbon dioxide does not rise like other gases because it has a density greater than what?    Choices:  - gravity  - light  - water  - air  A:
**Answer**
air

*Question*
Q: Mitosis and meiosis are both forms of division of the nucleus in these?    Choices:  - converts cells  - endogenous cells  - reproduction cells  - eukaryotic cells  A:
**Answer**
eukaryotic cells

*Question*
Q: Plants can absorb inorganic nutrients and water through their root system, and what gas from the environment?    Choices:  - hydrogen dioxide  - nitrogen dioxide  - chemical dioxide  - carbon dioxide  A:
**Answer**

carbon dioxide