Fact 1: Building housing developments usually requires replacing animal habitats. Fact 2: Habitat destruction is the primary cause of extinction or threat of extinction for all animals. Given the two facts above, building housing developments may cause ?

OPTIONS:
- eruptions
- colder weather
- disease
- erosion
- extinction
- mutations
- Destroy bridges
- deforestation

Answer: extinction

Fact 1: Viruses cause many human diseases. Fact 2: Influenza virus causes widespread human disease. Given the two facts above, what is influenza caused by?

OPTIONS:
- insects
- A bacteria
- smoking
- Mold
- Viruses
- amoeba
- Cold weather
- chemicals

Answer: Viruses

Fact 1: Mammals conserve body heat with their hair or fur. Fact 2: All monkeys are mammals. Given the two facts above, what conserves body heat with their hair or fur?

OPTIONS:
- weathering
- bears
- snakes
- dogs
- ants
- humans
- monkeys
- goats

Answer: monkeys

Fact 1: Erosion causes a river to become deeper and wider. Fact 2: Weathering and erosion continue to shape it today. Given the two facts above, weathering causes what to become deeper and wider?

OPTIONS:
- a landslide
- Sediment
- a mountain
- a volcano
- soils
- rock
- flooding
- a river

Answer:
a river