*Question*
Q: Which part of the earth is made of the rigid, brittle, solid crust and uppermost mantle? Choices: - troposphere - thermosphere - atmosphere - lithosphere A:
**Answer**
lithosphere

*Question*
Q: A hypothesis is scientific only if it can be tested by what? Choices: - independent variable - making a conclusion - carbon dating - making observations A:
**Answer**
making observations

*Question*
Q: What term is used to describe the total spread of values in a sample? Choices: - variety - axis - scale - range A:
**Answer**
range

*Question*
Q: What phylum has the highest number of species on earth? Choices: - lophotrochozoa - cephalopods - lichens - arthropods A:
**Answer**
arthropods