Problem:OPTIONS:
- sodium chloride
- salt water
- rivers
- the Pacific Ocean
- deserts
- fens
- wetland
- lakes

Fact 1: Freshwater biomes have water that contains little or no salt. Fact 2: Several freshwater lakes are nearby. Given the two facts above, what can contain little to no salt?
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A: lakes

Problem:OPTIONS:
- maples
- Species
- plants
- soil
- seeds
- animals
- Echinoids
- mushrooms

Fact 1: Planting trees has a positive impact on an ecosystem. Fact 2: Some trees are maples. Given the two facts above, what can be planted to have a positive impact on the ecosystem?
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A: maples

Problem:OPTIONS:
- decomposition
- erosion
- green manures
- evaporation
- fire
- nutrients
- dehydration
- water conservation

Fact 1: Decomposition increases amount of organic matter in soil. Fact 2: Organic mulch improves the soil. Given the two facts above, what improves the soil?
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A: decomposition

Problem:OPTIONS:
- insects
- animals
- Pride parades
- humans
- Social networks
- fur seals
- Leo's symbol
- Social circles

Fact 1: Lions live in social groups called prides. Fact 2: Leo's symbol is the lion. Given the two facts above, what live in social groups called prides?
****
A:
Leo's symbol