Problem:OPTIONS:
- mass and density
- the looseness of soil
- retaining heat
- direct damage to the lungs
- systolic blood pressure
- major threat to health
- metabolic reaction
- Veins and arteries.

Fact 1: Constriction occurs when the muscular walls of blood vessels contract. Fact 2: Systolic blood pressure is the force of blood on the blood vessel walls when the heart contracts. Given the two facts above, constricting raises what?
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A: systolic blood pressure

Problem:OPTIONS:
- hyperthyroidism
- Dehydration
- Greenhouse gases
- chemical reaction
- global warming
- contamination
- Air pollution
- sweating

Fact 1: High temperatures can cause an object to combust. Fact 2: Combustion of fuel is one of the main causes of air pollution. Given the two facts above, what can high temperatures cause?
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A: Air pollution

Problem:OPTIONS:
- offspring
- some mammals
- ancestors
- Nematoda
- heterotrophs
- animals
- minerals
- grandparents

Fact 1: Information in an organism 's chromosomes cause genetic traits to be passed down to that organism 's offspring. Fact 2: DNA, which contains our genetic code, is the basic building block of chromosomes. Given the two facts above, dNA causes what to inherit genetic traits?
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A: offspring

Problem:OPTIONS:
- being dead
- fungi
- amoeba
- offspring
- plants
- humans
- Flowers
- barnacles

Fact 1: Alternation of generations allows for both asexual and sexual reproduction. Fact 2: Plants have an alternation of generations. Given the two facts above, what allows for both asexual and sexual reproduction?
****
A:
plants