Fact 1: Flowing water can slowly dissolve carbon in sedimentary rock.  Fact 2: Rivers and streams are bodies of fresh, flowing water.  Given the two facts above, answer the question "What can slowly dissolve carbon in sedimentary rock?" with the following options:  - hydrocarbons  - acetic acid  - precipitation  - evaporation  - rivers and streams  - puddles  - ponds  - nitrogen
rivers and streams
Fact 1: Cold fronts cause thunderstorms as they pass by.  Fact 2: Thunderstorms Thunderstorms give birth to tornadoes.  Given the two facts above, answer the question "What causes tornadoes? " with the following options:  - Electrical energy  - scattered light  - hypothyroidism  - Time and energy  - harmful substances  - Cold fronts.  - Tropical  - heat energy
Cold fronts.
Q: Fact 1: Dilation occurs when cell walls relax.  Fact 2: Conversely, a decrease in light intensity causes dilation of the pupils.  Given the two facts above, answer the question "What can cause cell walls to relax?" with the following options:  - Decreased light intensity  - Something coming from a gland  - matter vibrating  - Temperature changing  - Water vapor cooling  - the Earth being tilted  - raising their temperature  - heat produced
A: Decreased light intensity
Question: Fact 1: Lung cancer is most often caused by exposure to tobacco smoke.  Fact 2: Tobacco is most commonly smoked in cigarettes.  Given the two facts above, answer the question "What is lung cancer most often caused by exposure to?" with the following options:  - Chemical energy  - carbon dioxide  - asbestos  - sunlight  - water  - fossil fuels  - cigarettes  - hydrocarbons
Answer: cigarettes
*Question*
Fact 1: Vertebrates are all chordates that have a backbone.  Fact 2: Invertebrates are animals who lack a backbone or spinal column.  Given the two facts above, answer the question "What do all vertebrates have that invertebrates don't?" with the following options:  - sensory neurons  - fur and fat  - bones and joints  - a jaw bone  - kinetic energy  - Chemical energy  - a spinal column  - a set of gills
**Answer**
a spinal column
*Question*
Fact 1: Conserving water can be used for survival in a dry environment.  Fact 2: Deserts are usually very, very dry.  Given the two facts above, answer the question "What can be used for survival in the desert?" with the following options:  - nutrients  - shade  - food and shelter  - salt and water.  - heat  - picnics  - Conserving water  - Chemical energy
**Answer**

Conserving water