Question:
Use evidence from the fact that carbon dioxide concentrations in the air have increased over the last decade dramatically to answer the following question. OPTIONS:
- more cattle produced
- more plant life
- human population increased
- less water area "More carbon dioxide is in the air in the past decade than ever before, probably because"

Answer:
human population increased

Question:
Use evidence from the fact that some animals live in zoo exhibits to answer the following question. OPTIONS:
- an osprey
- bacteria
- a human
- a dinosaur "Which is likely to be in a zoo exhibit?"

Answer:
an osprey

Question:
Use evidence from the fact that an landfill is a source of pollution to answer the following question. OPTIONS:
- trash heaps
- land tracts
- bottle deposits
- water droplets "A person can see a large pollutant source when looking at"

Answer:
trash heaps