Q: Fact 1: Menopause occurs when menstruation stops occurring, usually in middle adulthood. Fact 2: Today, Menopause is seen more as a gateway to a second adulthood. Given the two facts above, a gateway to second adulthood occurs when what happens? | OPTIONS:
- produce is farmed
- bodies are dissected
- Plant growth is reduced
- rapid expansion
- Temperature changing
- Movement of an air mass
- menstruation stops
- genes are shared
A: menstruation stops

Q: Fact 1: Harming an animal species causes that animal 's population to decrease. Fact 2: Air pollution also harms plants and animals. Given the two facts above, what causes an animal population to decrease? | OPTIONS:
- sound pollution
- Greenhouse gases
- Pesticides
- water
- fossil fuels
- Air pollution
- animal diversity
- steroids
A: Air pollution

Q: Fact 1: Most canyons are formed by flowing rivers through erosion over long periods of time. Fact 2: Canyon formed as a consequence of river erosion. Given the two facts above, what does erosion form? | OPTIONS:
- valleys
- Sediment
- mountains
- canyons
- soils
- hills
- soft soil
- loose soil
A: canyons

Q: Fact 1: Microbial fuel cells convert chemical energy into electrical energy. Fact 2: Food is chemical energy. Given the two facts above, what converts food into electrical energy? | OPTIONS:
- transportation technology
- windmills
- matter vibrating
- solar panels
- adding heat
- one celled organisms
- microbial fuel cells
- dams
A: microbial fuel cells