Problem:OPTIONS:
- density
- cigarettes
- Earth orbiting the Sun
- gravity
- thyroid hormones
- force
- Climate change
- Temperature changing

Fact 1: Thyroid hormones increase the rate of metabolism in cells throughout the body. Fact 2: Everyone has a different metabolism. Given the two facts above, what effects everyone differently?
****
A: thyroid hormones

Problem:OPTIONS:
- energy usage
- Greenhouse gasses
- acid rain
- harmful substances
- Greenhouse gases
- temperature
- prolactin release
- storms

Fact 1: Riding a bike does not cause pollution. Fact 2: City employees use bicycles on the job to save energy and reduce air pollution. Given the two facts above, riding a bike reduces what?
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A: energy usage

Problem:OPTIONS:
- recovery
- Absorb light
- evolution
- Plants growth
- migrate
- recycling
- resistance
- allow growth

Fact 1: Mutations are essential for evolution to occur. Fact 2: Mutations in somatic cells are called somatic mutations . Given the two facts above, what do somatic cells perform?
****
A: evolution

Problem:OPTIONS:
- resistance
- Veins and arteries.
- Leptospirosis
- sensory neurons
- bilateral symmetry
- parasites
- food and shelter
- aerobic capacity

Fact 1: Flatworms belong to the phylum Platyhelminthes. Fact 2: Flatworms are bilaterally symmetric. Given the two facts above, what does the phylum Platyhelminthes usually have?
****
A:
bilateral symmetry