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

*Question*
Q: Why are seeds of a pine cone easily carried by the wind and dispersed? Choices: - seeds are sticky - seeds are small - seeds are dense - seeds have wings A:
**Answer**
seeds have wings

*Question*
Q: What type of reproduction results in genetically unique offspring? Choices: - mitosis - asexual reproduction - internal reproduction - sexual reproduction A:
**Answer**
sexual reproduction

*Question*
Q: What is the matter through which sound waves travel? Choices: - dust - mass - air - medium A:
**Answer**
medium