Problem:OPTIONS:
- overpopulation
- water consumption
- loose soil
- Quality of life
- agriculture
- deforestation
- ecotourism
- trees

Fact 1: Biodiversity increases the productivity and stability of ecosystems. Fact 2: Ecotourism, on the other hand, can help to conserve biodiversity. Given the two facts above, what increases the stability of ecosystems?
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A: ecotourism

Problem:OPTIONS:
- Most plants
- organs
- Plant reproduction
- ova and spermatozoa
- remains of prehistoric life
- hydrogen
- mitosis
- allow growth

Fact 1: Meiosis is the type of cell division that produces gametes. Fact 2: Examples of gametes are ova and spermatozoa. Given the two facts above, meiosis is the type of cell division that produces what?
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A: ova and spermatozoa

Problem:OPTIONS:
- resistance activities
- fantasy football
- sitting down
- Relieve pain
- Something that is self-aware
- running for office
- animal behaviorists
- Riding a bike

Fact 1: Exercise increases a body 's strength. Fact 2: Strength is increased by resistance activities. Given the two facts above, which of the following are a type of exercise?
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A: resistance activities

Problem:OPTIONS:
- Electrical energy
- chemical reaction
- automobile exhaust
- Something to move
- air pollution
- distracted driving
- electric outages
- Dehydration

Fact 1: Coal is used for generating heat by burning. Fact 2: Coal burning can cause air pollution and generate carcinogens. Given the two facts above, heating with coal can cause ?
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A:
air pollution