Problem:OPTIONS:
- population decline
- improved eyesight
- earthquakes
- It helps them survive
- heat produced
- aggressive behavior
- produce offspring
- biological diversity

Fact 1: Competition may lead to aggressive behaviors or displays of aggression. Fact 2: Human mating behavior also involves some competition. Given the two facts above, human mating may lead to ?
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A: aggressive behavior

Problem:OPTIONS:
- oxygen
- Energy
- matter
- carbon
- sodium
- helium
- rock salt
- heat

Fact 1: Carbon may be stored in sedimentary rock for millions of years. Fact 2: Limestone is a type of sedimentary rock. Given the two facts above, what element can be stored in limestone for millions of years?
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A: carbon

Problem:OPTIONS:
- expands
- Energy.
- breaks
- blossoms
- burning
- voltage
- improve
- decreases

Fact 1: When metal conducts heat , that metal expands. Fact 2: When a metal rod is warmed, the transfer of heat is by conduction. Given the two facts above, when metal is warmed, the transfer of heat does what to metal?
****
A: expands

Problem:OPTIONS:
- rotate
- rest
- Injury
- moves
- heat
- burn
- Rise
- vibrate

Fact 1: Absorbing energy causes objects to heat. Fact 2: If no radiation energy is absorbed, no damage is done. Given the two facts above, radiation energy causes objects to what?
****
A:
heat