Problem:OPTIONS:
- rapid expansion
- Decreased precipitation
- a tree falling
- the production of heat
- Lower average temperature
- Physical weathering
- a lot of human deaths
- Plant growth is reduced

Fact 1: The movement of tectonic plates causes volcanic eruptions. Fact 2: Large volcanic eruptions can decrease (reduce)the earth's average temperature by (a) emitting particles into the stratosphere, thereby increasing the albedo. Given the two facts above, what effect could more active plate tectonics have on the earth?
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A: Lower average temperature

Problem:OPTIONS:
- Chemical energy
- Veins and arteries.
- layers of fat
- sweating
- protein hormones
- aqueous solution
- oxidation reaction
- pancreas

Fact 1: Insulin helps cells take up glucose from the blood. Fact 2: For example, insulin is a protein hormone. Given the two facts above, what helps cells take up glucose from the blood?
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A: protein hormones

Problem:OPTIONS:
- heat
- UV
- RNA
- stars
- tides
- asteroids
- sun
- mass

Fact 1: The moon revolving around the Earth causes the phases of the moon. Fact 2: Phases of the moon, however, depend on the relative positions of the Earth, moon, and Sun. Given the two facts above, what do moon phases depend on?
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A: sun

Problem:OPTIONS:
- Electrical energy
- Chemical energy
- visible energy
- Decibels
- pheremon traits
- heat energy
- refraction of light
- mechanical waves

Fact 1: Ants communicate with chemicals called pheromones. Fact 2: Ants communicate with the colony in the form of what is called pheremon trails. Given the two facts above, ants communicate with the colony using what?
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A:
pheremon traits