Q: Fact 1: The number of rings in a tree trunk can be used to estimate the age of the tree. Fact 2: Tree-ring dating the 1700 Cascadia earthquake. Given the two facts above, estimating the age of trees can be used for what? | OPTIONS:
- genetic diversity
- they body they live in
- earthquake history
- food and shelter
- gardening
- important habitats
- bird watching
- recreation
A: earthquake history

Q: Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. Fact 2: Acid rain kills trees . Given the two facts above, what does gases from burning coal and oil dissolving in water in the atmosphere do? | OPTIONS:
- chemical changes
- saves trees
- forms diamonds
- vaporization
- heating liquids
- kills trees
- weathering
- Pollution
A: kills trees

Q: Fact 1: Some touch receptors sense differences in temperature or pain. Fact 2: Temperature Temperature is an measurement of the amount of heat. Given the two facts above, what do some touch receptors sense differences in? | OPTIONS:
- voltage
- visible energy
- fingers
- refraction of light
- gravity shifts
- amount of heat
- the skin
- change in density
A: amount of heat

Q: Fact 1: Food consists of organic molecules that store energy in their chemical bonds. Fact 2: Many of the molecules in food are called nutrients. Given the two facts above, what are nutrients, basically? | OPTIONS:
- nucleus
- protoplasm
- glucose
- allow growth
- cells
- roots
- health
- molecules
A: molecules