Q: Reducing the production of what gas, or removing it from the air, are practices that could reduce global warming? Choices: - helium - hydrogen - oxygen - carbon dioxide A:
carbon dioxide

Q: What type of environment is maintained in homeostasis? Choices: - fluid internal - noisy internal - stable external - constant internal A:
constant internal

Q: Q: Marine fishes take in divalent ions by incessantly drinking what? Choices: - sand - oxygen - algae - seawater A:
A: seawater

Question: Q: Radiation can be absorbed or shielded by materials, particularly what material used to make protective aprons worn by x-ray administrators? Choices: - cotton - steel - carbon - lead A:
Answer: lead

*Question*
Q: The largest absorption of heat comes during the vaporization of what? Choices: - ice - carbon dioxide - magma - liquid water A:
**Answer**
liquid water

(Question)
Q: What atmospheric layer lies above the highest altitude an airplane can go and below the lowest altitude a spacecraft can orbit? Choices: - stratosphere - troposphere - thermosphere - mesosphere A:
(Answer)
mesosphere