*Question*
Q: What is the upper-most atmosphere known as? Choices: - xerosphere - exosphere - ionosphere - thermosphere A:
**Answer**
thermosphere

*Question*
Q: Does pressure increase or decrease when gas particles heat up? Choices: - decreases - stays constant - stagnates - increase A:
**Answer**
increase

*Question*
Q: What type of bacteria stains red? Choices: - gram - such bacteria - kilogram-negative bacteria - calcium - negative bacteria - gram-negative bacteria A:
**Answer**
gram-negative bacteria

*Question*
Q: The process in which organ systems work to maintain a stable internal environment is called what? Choices: - consciousness - thrombosis - ketosis - homeostasis A:
**Answer**
homeostasis