Fact 1: Conserving water can be used for survival in a dry environment. Fact 2: Many cacti have corrugated stems which can expand quickly if water becomes available. Given the two facts above, what feature of many cacti help them survive in dry environments?

OPTIONS:
- exoskeleton
- Spines for hunting
- Expandable stems
- an external framework
- cactuses
- Cooling pipes
- genetic diversity
- Loud organ pipes

Answer: Expandable stems

Fact 1: Alaser is used for producing light. Fact 2: Also, very powerful, high concentration lasers can burn or cut the skin. Given the two facts above, what can burn the skin?

OPTIONS:
- cream
- light
- ointment
- the sun
- Lukewarm water
- cigars
- Acids
- NaCl

Answer: light

Fact 1: All cells share some of the same structures and basic functions. Fact 2: Cells are also the basic functioning unit of life. Given the two facts above, the basic functioning unit of life all share the same what?

OPTIONS:
- structure
- four limbs
- organ
- Chlorophyll
- Energy
- layers of fat
- health
- Energy.

Answer: structure

Fact 1: Soil is formed by rocks eroding. Fact 2: Rivers erode the rocks they flow over. Given the two facts above, what is formed by rivers flowing over rocks?

OPTIONS:
- soil
- cracks
- thrust
- rain
- biome
- spring
- potash
- tube

Answer:
soil