Q: Nitrogen and sulfur oxides form what type of rain? Choices: - common rain - toxic rain - heavy rain - acid rain A:
acid rain

Q: What is the study of ecosystems? Choices: - physics - botany - geology - ecology A:
ecology

Q: Q: Which generation of a plant is generally larger and longer-lived? Choices: - main generation - effective generation - alpha generation - dominant generation A:
A: dominant generation

Question: Q: What element do nuclear power plants use in fuel rods? Choices: - plutonium - boron - magnesium - uranium A:
Answer: uranium

*Question*
Q: Why does photosynthesis not occur in the deep-water zone? Choices: - it is cold - it is pressurized - it is stagnant - it is dark A:
**Answer**
it is dark

Q: Q: Evidence for the presence of what on mars makes scientists think that life might have existed there in the past? Choices: - gas - plasma - air - water A:
A: water