Q: Quantum chromodynamics combines what property with quark theory? Choices: - mass - contrast - sound - color A:
color

Q: What is the term for the process of exposing a person to a pathogen on purpose in order to develop immunity? Choices: - evacuation - ramping - priming - vaccination A:
vaccination

Q: Q: What is the concentration of gas molecules in the mesosphere? Choices: - high density - low density - medium density - very low density A:
A: very low density

Question: Q: What needs to happen to temperature to cause pressure to increase dramatically? Choices: - boiling point - no increase - small increase - large increase A:
Answer: large increase

*Question*
Q: What is the hardest type of coal? Choices: - Bituminous - lignite - peat - anthracite A:
**Answer**
anthracite

Q: Q: What is needed by all known forms of life? Choices: - nitrogen - warmth - air - water A:
A: water