If rivers and streams can slowly dissolve carbon in sedimentary rock, then what can slowly dissolve carbon in sedimentary rock?  Answer choices: - hydrocarbons  - acetic acid  - precipitation  - evaporation  - rivers and streams  - puddles  - ponds  - nitrogen
rivers and streams

If cold fronts cause tornadoes, then what causes tornadoes?  Answer choices: - Electrical energy  - scattered light  - hypothyroidism  - Time and energy  - harmful substances  - Cold fronts.  - Tropical  - heat energy
Cold fronts.

Q: If decreased light intensity can cause cell walls to relax, then what can cause cell walls to relax?  Answer choices: - 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: If lung cancer is most often caused by exposure to cigarettes, then what is lung cancer most often caused by exposure to?  Answer choices: - Chemical energy  - carbon dioxide  - asbestos  - sunlight  - water  - fossil fuels  - cigarettes  - hydrocarbons
Answer: cigarettes

*Question*
If vertebrates are all chordates that have a spinal column, then what do all vertebrates have that invertebrates don't?  Answer choices: - 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*
If conserving water can be used for survival in deserts, then what can be used for survival in the desert?  Answer choices: - nutrients  - shade  - food and shelter  - salt and water.  - heat  - picnics  - Conserving water  - Chemical energy
**Answer**

Conserving water