Fact 1: Cells secrete acids and bases to maintain the proper pH for enzymes to work. Fact 2: An enzyme is a biological catalyst . Given the two facts above, catalysts require proper what to work?
OPTIONS:
- DNA
- pH
- pan
- RNA
- elevation
- time of day
- gas
- humidity
pH

Fact 1: Faulting of rock in Earth 's crust causes earthquakes. Fact 2: Thrust faults are a result of compressional forces in the Earth's crust. Given the two facts above, what causes earth quakes?
OPTIONS:
- electromagnetic energy
- movement
- harmful substances
- the force
- shaking
- compressional forces
- Water expanding
- energy of moving objects

Answer: compressional forces

Question: Fact 1: Playing is one way mammals and other animals learn how to behave. Fact 2: Cats are Mammals that Shed Dogs are Mammals that Wag their tails. Given the two facts above, playing is one way what learn how to behave?
OPTIONS:
- otters
- bacteria
- cats
- bears
- ants
- grass
- humans
- bats
Answer: cats

input with options: Fact 1: Infection can cause bodily tissues to swell. Fact 2: Antihistamines reduce swelling in mucous membranes and soft tissues. Given the two facts above, what can help with sinus infections?
OPTIONS:
- arteries
- hydration
- one celled organisms
- prolactin release
- radiography
- Enzymes
- antihistamines
- aqueous solution
output: antihistamines

Q: Fact 1: All life relies on a relatively narrow range of pH, or acidity. Fact 2: All organisms have life cycles. Given the two facts above, what relies on a relatively narrow range of acidity?

OPTIONS:
- organisms
- carbon
- animals
- hydrogen
- density
- trees
- Most plants
- barnacles

A: organisms

Fact 1: Creating paper requires cutting down trees. Fact 2: Trees only grow to be cut down. Given the two facts above, what needs to grow for paper to be made?
OPTIONS:
- paper
- books
- trees
- birds
- grass
- flowers
- fibers
- plants
trees