*Question*
Q: Who is said to have dropped two objects of different masses from the tower of pisa? Choices: - darwin - copernicus - newton - galileo A:
**Answer**
galileo

*Question*
Q: What do you call elements that contain only atoms of one type of element? Choices: - typical elements - noble gases - reactive elements - native elements A:
**Answer**
native elements

*Question*
Q: What makes toenails and fingernails hard? Choices: - guanine - cellulose - taurine - keratin A:
**Answer**
keratin

*Question*
Q: What does a thermometer measure? Choices: - oxygen - precipitation - size - temperature A:
**Answer**
temperature