Problem: OPTIONS:
- duplicate itself
- observe it
- debate them
- Temperature
- Time and energy
- determine them
- remove them
- assign them
Q: Fact 1: Radioactive dating is used to determine the age of fossils. Fact 2: Radioactive isotopes are commonly used for dating . Given the two facts above, radioactive isotopes are commonly used to do what to the age of fossils?
Answer: determine them

Problem:OPTIONS:
- bears
- insects
- fur seals
- phytoplankton
- bacteria
- viruses
- mammals
- bees

Fact 1: Mating is generally preceded by courtship. Fact 2: Normally, however, insect pheromones function to attract mates for reproduction. Given the two facts above, what uses pheromones for courtship?
****
A: insects

Fact 1: Afire requires oxygen to burn. Fact 2: In the vacuum of space, there's no oxygen to burn. Given the two facts above, fires cannot burn where?
OPTIONS:
- dormant state
- one celled organisms
- in the atmosphere
- in a pit
- in the woods
- In the winter
- the Great Barrier Reef
- vacuum of space
vacuum of space

Fact 1: The movement of tectonic plates causes volcanic eruptions. Fact 2: Earthquakes are caused by movement of the tectonic plates. Given the two facts above, what causes volcanic eruptions?
OPTIONS:
- eukyarotes
- Water expanding
- heating liquids
- Greenhouse gases
- earthquakes
- heat energy
- scattered light
- kinetic energy

Answer: earthquakes

Question: Fact 1: Soil is formed by rocks eroding. Fact 2: Soils are formed by breakdown of rock. Given the two facts above, what does rock erosion cause them to do?
OPTIONS:
- turn gaseous
- secrete h2o
- breakdown
- become hydrogen
- they bend
- dangerous
- migrate
- watershred
Answer: breakdown

input: OPTIONS:
- CO2
- H20
- RNA
- UV
- urea
- Dew
- h2o
- rain Now, answer this question: Fact 1: Astem is used to store water by some plants. Fact 2: Water is made up of H2O molecules. Given the two facts above, what do some plants use a stem to store?
A:
output:
h2o