Problem:OPTIONS:
- dangerous
- negative
- uncontrolled
- mechanical
- unpredictable
- growing
- positive
- Pollution

Fact 1: Cutting down trees has a negative impact on an ecosystem. Fact 2: An ecosystem can be in a desert, a tropical jungle, an ocean or a pond. Given the two facts above, what type of impact does cutting down trees have on jungles?
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A: negative

Problem:OPTIONS:
- stealing seeds
- graptolites
- asexual reproduction
- impregnating men
- allow growth
- Most plants
- making babies
- peachleaf willow

Fact 1: Sporangia produce spores that develop into tiny, heart-shaped gametophytes. Fact 2: Asexual reproduction is by spores produced in stalked sporangia . Given the two facts above, what by spores develop into tiny, heart-shaped gametophytes?
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A: asexual reproduction

Problem:OPTIONS:
- flow of electrons
- kinetic energy
- deoxygenated blood
- the body's largest organ
- Electrical energy
- energy of moving objects
- refraction of light
- electromagnetic energy

Fact 1: Veins generally carry deoxygenated blood. Fact 2: Veins push blood toward the heart. Given the two facts above, what is carried toward the heart?
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A: deoxygenated blood

Problem:OPTIONS:
- genetic morphing
- death
- gene flow
- movement
- generic flow
- interact
- competition
- gene expression

Fact 1: Gene flow occurs when individuals move into or out of a population. Fact 2: People are individuals, and each person has different needs. Given the two facts above, what happens when people flow into or out of a population?
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A:
gene flow