*Question*
Q: He mass spectrometer measures the percent abundance of different what? Choices: - reactions - organisms - Proteins - isotopes A:
**Answer**
isotopes

*Question*
Q: What type of plant is the dominant group of land plants? Choices: - grass plants - oxygen plants - thermal plants - vascular plants A:
**Answer**
vascular plants

*Question*
Q: What elements have the highest attraction for electrons? Choices: - gases - metals - carbons - nonmetals A:
**Answer**
nonmetals

*Question*
Q: When atoms gain or lose electrons, they can form electrically charged particles called what? Choices: - crystals - eons - toxins - ions A:
**Answer**
ions