Problem:OPTIONS:
- lagoon
- graptolites
- a cuticle
- barnacles
- bioaerosols
- cave
- coral reef
- salt and water.

Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. Fact 2: Coral reefs are made up of the accumulated exoskeletons of the coral polyp. Given the two facts above, what do coral polyps form?
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A: coral reef

Problem:OPTIONS:
- feet
- air
- triceps
- movement
- oxygen
- keratin
- gills
- lungs

Fact 1: Skin is used for breathing air by frogs. Fact 2: Frogs breathe with their lungs and skin. Given the two facts above, what do frogs breathe with?
****
A: lungs

Problem:OPTIONS:
- burning coal
- Sulfur dioxide
- replanting forests
- solar system
- Greenhouse gasses
- chlorofluorocarbons
- life cycle
- deforestation

Fact 1: Carbon cycles quickly between organisms and the atmosphere. Fact 2: Deforestation also disrupts the Carbon Cycle. Given the two facts above, what disrupts the cycle between organisms and the atmosphere?
****
A: deforestation

Problem:OPTIONS:
- puddles
- microorganisms
- ponds
- nitrogen
- swamp vegetation
- Veins and arteries.
- streams and creeks
- peachleaf willow

Fact 1: Running water is better able to dissolve oxygen and nutrients than standing water. Fact 2: Streams and creeks provide running water. Given the two facts above, what is better able to dissolve oxygen and nutrients than standing water?
****
A:
streams and creeks