Q: What harmful light does ozone reduce in the upper atmospheres? Choices: - infrared light - visible light - specific light - ultraviolet light A:
ultraviolet light

Q: Chemical reactions are typically written to imply that they proceed in one direction - if they can occur in either direction, they are considered what? Choices: - singular - observable - reactive - reversible A:
reversible

Q: Q: What is required for both the synthesis and breakdown of molecules? Choices: - sunlight - mixing - heating - energy A:
A: energy

Question: Q: A problem with using food chains to describe ecosystems is that some organisms can feed on or be consumed by species from more than one of what level? Choices: - biome level - habitat level - pH level - trophic level A:
Answer: trophic level

*Question*
Q: Helium-3 is produced by beta decay of a certain what? Choices: - electron - quark - particle - nuclide A:
**Answer**
nuclide

(Question)
Q: Energy that the sun and other stars release into space is called what? Choices: - static energy - kinetic energy - mechanical energy - electromagnetic energy A:
(Answer)
electromagnetic energy