*Question*
Q: When an oxidation number of an atom is decreased in the course of a redox reaction, that atom is being what? Choices: - replaced - increased - destroyed - reduced A:
**Answer**
reduced

*Question*
Q: What type of organism is algae? Choices: - virus - amoeba - yeast - bacteria (cyanobacteria) A:
**Answer**
bacteria (cyanobacteria)

*Question*
Q: What kind of energy positions do electrons occupy during ground state? Choices: - closest energy positions - relative energy positions - highest energy positions - lowest energy positions A:
**Answer**
lowest energy positions

*Question*
Q: What is the process by which the remains of living things become fossils? Choices: - decomposition - sublimation - petrification - fossilization A:
**Answer**
fossilization