Problem:OPTIONS:
- peachleaf willow
- chlorophyll
- Chemical energy
- xylem cells
- Plants growth
- Most plants
- elastin
- melanin

Fact 1: Chloroplasts contain the green pigment chlorophyll. Fact 2: Most chloroplasts are found in leaves. Given the two facts above, leaves contain the green pigment ?
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A: chlorophyll

Problem:OPTIONS:
- a long period of time
- The area was once underwater
- a brief period of time
- just a day's time
- Physical weathering
- It used to be covered by water
- movements in the earth's crust
- a quick period of time

Fact 1: Being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time. Fact 2: Wetlands Wetlands are also called swamps or marshes. Given the two facts above, buried vegetation in a wetland changes to peat over what?
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A: a long period of time

Problem:OPTIONS:
- complex
- PDAs
- groups
- protected
- prides
- murders
- flocks
- dangerous

Fact 1: Lions live in social groups called prides. Fact 2: Chimpanzees live in social groups called communities. Given the two facts above, what are lion communities called?
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A: prides

Problem:OPTIONS:
- Pollution
- mildew
- gas
- influenza
- oxygen
- bacteria
- smallpox
- gold

Fact 1: Amold spore has a negative impact on the respiratory system. Fact 2: Mildew and mold spores are everywhere. Given the two facts above, what can affect the respiratory system?
****
A:
mildew