Q: These microorganisms are abundant in the human digestive track and serve many roles. what are they? Choices: - antioxidants - pathogens - tumors - bacteria A:
bacteria

Q: The explosion of nitroglycerin, which releases large volumes of gases, is what type of reaction? Choices: - energetic - exponential - endothermic - exothermic A:
exothermic

Q: Q: What is the term for much bigger evolutionary changes that result in new species? Choices: - recalibration - breaking away - regression - macroevolution A:
A: macroevolution

Question: Q: What is the name of a branch of the chemistry that deals with the interconversion of chemical energy and electrical energy? Choices: - Inorganic chemistry - Biochemistry - Theoretical Chemistry - electrochemistry A:
Answer: electrochemistry

*Question*
Q: An aquifer is an underground layer of rock that is saturated with what? Choices: - ocean water - wastewater - oil - groundwater A:
**Answer**
groundwater

Q: The risk of what is raised by overexposure to the sun? Choices: - particle cancer - flux cancer - brain cancer - skin cancer A:
skin cancer