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?

OPTIONS:
- duplicate itself
- observe it
- debate them
- Temperature
- Time and energy
- determine them
- remove them
- assign them

Answer: determine them

Problem: OPTIONS:
- fur seals
- energy of moving objects
- electromagnetic energy
- sensory neurons
- Electric devices
- Most invertebrates
- matter vibrating
- Veins and arteries.
Q: Fact 1: Most invertebrates have a nervous system. Fact 2: Afferent information is information that is inbound to the nervous system. Given the two facts above, what have afferent information inbound?
Answer: Most invertebrates

Problem:OPTIONS:
- athletes
- acetic acid
- sweating
- Endocrine system
- heat or cold
- Electrical energy
- Veins and arteries.
- sensory neurons

Fact 1: Hormones are chemical messengers that control many body functions. Fact 2: Hormones are produced and released by the endocrine system . Given the two facts above, which body system releases chemical messengers that control many body functions?
****
A: Endocrine system

Fact 1: Chemical weathering causes iron in rock to oxidize. Fact 2: Chemical weathering is the chemical disintigration of rocks. Given the two facts above, the chemical disintegration of rocks causes iron in rocks to what?
OPTIONS:
- oxidize
- heat
- break off
- Rise
- Bend
- size
- inactive
- deadly
oxidize

Fact 1: Echinoderms have a unique water vascular system with tube feet. Fact 2: Starfish and sea urchins are also echinoderms. Given the two facts above, what have a unique water vascular system with tube feet?
OPTIONS:
- h2o
- insects
- sea urchins
- bushes
- Most plants
- Conifers
- orchids
- humans

Answer: sea urchins

input with options: Fact 1: Energy is used for heating a building by a heating system. Fact 2: Radiators are used to heat the building, The energy source is oil. Given the two facts above, what is used to heat a building?
OPTIONS:
- water
- iron
- coal
- fire
- gas
- CFCs
- oxygen
- oil
output:
oil