Problem: OPTIONS:
- By wind and rain
- permineralization
- The bending of a ray of light
- Something with a head, thorax, and abdomen
- a decrease in differentiation
- competing for resources
- barks and snarls
- metabolic reaction
Q: Fact 1: Gene flow occurs when individuals move into or out of a population. Fact 2: Gene flow tends to decrease differentiation. Given the two facts above, what tends to occur when individuals move in and out of a population?
Answer: a decrease in differentiation

Problem:OPTIONS:
- resistance activities
- Veins and arteries.
- A Greek letter
- sensory neurons
- fur seals
- parasites
- units of heredity
- colors of the spectrum

Fact 1: Most genes contain the instructions for a single protein. Fact 2: Genes are the basic unit of heredity. Given the two facts above, what mostly contain the instructions for a single protein?
****
A: units of heredity

Fact 1: Heavy rains cause flooding. Fact 2: Fifty to 100 homes are either flooded or in danger of flooding. Given the two facts above, what weather damages homes?
OPTIONS:
- dry and hot
- Water expanding
- Heavy rain
- Tropical
- Sunny skies
- Clouds
- erosion
- Breezes
Heavy rain

Fact 1: Agraduated cylinder is used to measure volume of a liquid. Fact 2: Most of the earth's water is liquid. Given the two facts above, the volume of what can be measured with a graduated cylinder?
OPTIONS:
- vinegar
- milk
- vapors
- ruler
- blood
- water
- gas
- rocks

Answer: water

Question: Fact 1: The surface of a beach is formed by mechanical weathering. Fact 2: Most beaches are of white coral sand. Given the two facts above, what action produces much of the sand from coral?
OPTIONS:
- reef building
- radioactive decay
- mechanical waves
- glass blowing
- It used to be covered by water
- The area was once underwater
- Mechanical weathering
- By coral exoskeletons
Answer: Mechanical weathering

input: OPTIONS:
- stabilizes
- threatened
- reduce
- increases
- decreases
- contracting
- maintains
- It expands Now, answer this question: Fact 1: Drought is when amount of precipitation decreases. Fact 2: Some researches have reported that acid precipitation decreases crop productivity. Given the two facts above, crop productivity does what during a drought?
A:
output:
decreases